Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf into perf/core

Pull perf/core improvements and fixes from Jiri Olsa:

  * Add IO mode into timechart command (Stanislav Fomichev)

Signed-off-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

4 files changed, 845 insertions, 60 deletions

diff --git a/tools/perf/Documentation/perf-timechart.txt b/tools/perf/Documentation/perf-timechart.txt
index 5e0f986dff38..df98d1c82688 100644
--- a/tools/perf/Documentation/perf-timechart.txt
+++ b/tools/perf/Documentation/perf-timechart.txt
@@ -15,10 +15,20 @@ DESCRIPTION
 There are two variants of perf timechart:
 
   'perf timechart record <command>' to record the system level events
-  of an arbitrary workload.
+  of an arbitrary workload. By default timechart records only scheduler
+  and CPU events (task switches, running times, CPU power states, etc),
+  but it's possible to record IO (disk, network) activity using -I argument.
 
   'perf timechart' to turn a trace into a Scalable Vector Graphics file,
-  that can be viewed with popular SVG viewers such as 'Inkscape'.
+  that can be viewed with popular SVG viewers such as 'Inkscape'. Depending
+  on the events in the perf.data file, timechart will contain scheduler/cpu
+  events or IO events.
+
+  In IO mode, every bar has two charts: upper and lower.
+  Upper bar shows incoming events (disk reads, ingress network packets).
+  Lower bar shows outgoing events (disk writes, egress network packets).
+  There are also poll bars which show how much time application spent
+  in poll/epoll/select syscalls.
 
 TIMECHART OPTIONS
 -----------------
@@ -54,6 +64,19 @@ TIMECHART OPTIONS
         duration or tasks with given name. If number is given it's interpreted
         as number of nanoseconds. If non-numeric string is given it's
         interpreted as task name.
+--io-skip-eagain::
+        Don't draw EAGAIN IO events.
+--io-min-time=<nsecs>::
+        Draw small events as if they lasted min-time. Useful when you need
+        to see very small and fast IO. It's possible to specify ms or us
+        suffix to specify time in milliseconds or microseconds.
+        Default value is 1ms.
+--io-merge-dist=<nsecs>::
+        Merge events that are merge-dist nanoseconds apart.
+        Reduces number of figures on the SVG and makes it more render-friendly.
+        It's possible to specify ms or us suffix to specify time in
+        milliseconds or microseconds.
+        Default value is 1us.
 
 RECORD OPTIONS
 --------------
@@ -63,6 +86,9 @@ RECORD OPTIONS
 -T::
 --tasks-only::
         Record only tasks-related events
+-I::
+--io-only::
+        Record only io-related events
 -g::
 --callchain::
         Do call-graph (stack chain/backtrace) recording
@@ -87,6 +113,14 @@ Record system-wide timechart:
 
   $ perf timechart --highlight gcc
 
+Record system-wide IO events:
+
+  $ perf timechart record -I
+
+  then generate timechart:
+
+  $ perf timechart
+
 SEE ALSO
 --------
 linkperf:perf-record[1]
diff --git a/tools/perf/builtin-timechart.c b/tools/perf/builtin-timechart.c
index 74db2568b867..04c9c53becad 100644
--- a/tools/perf/builtin-timechart.c
+++ b/tools/perf/builtin-timechart.c
@@ -60,10 +60,17 @@ struct timechart {
                                 tasks_only,
                                 with_backtrace,
                                 topology;
+        /* IO related settings */
+        u64                     io_events;
+        bool                    io_only,
+                                skip_eagain;
+        u64                     min_time,
+                                merge_dist;
 };
 
 struct per_pidcomm;
 struct cpu_sample;
+struct io_sample;
 
 /*
  * Datastructure layout:
@@ -84,6 +91,7 @@ struct per_pid {
         u64             start_time;
         u64             end_time;
         u64             total_time;
+        u64             total_bytes;
         int             display;
 
         struct per_pidcomm *all;
@@ -97,6 +105,8 @@ struct per_pidcomm {
         u64             start_time;
         u64             end_time;
         u64             total_time;
+        u64             max_bytes;
+        u64             total_bytes;
 
         int             Y;
         int             display;
@@ -107,6 +117,7 @@ struct per_pidcomm {
         char            *comm;
 
         struct cpu_sample *samples;
+        struct io_sample  *io_samples;
 };
 
 struct sample_wrapper {
@@ -131,6 +142,27 @@ struct cpu_sample {
         const char *backtrace;
 };
 
+enum {
+        IOTYPE_READ,
+        IOTYPE_WRITE,
+        IOTYPE_SYNC,
+        IOTYPE_TX,
+        IOTYPE_RX,
+        IOTYPE_POLL,
+};
+
+struct io_sample {
+        struct io_sample *next;
+
+        u64 start_time;
+        u64 end_time;
+        u64 bytes;
+        int type;
+        int fd;
+        int err;
+        int merges;
+};
+
 #define CSTATE 1
 #define PSTATE 2
 
@@ -213,7 +245,7 @@ static void pid_fork(struct timechart *tchart, int pid, int ppid, u64 timestamp)
                 pid_set_comm(tchart, pid, pp->current->comm);
 
         p->start_time = timestamp;
-        if (p->current) {
+        if (p->current && !p->current->start_time) {
                 p->current->start_time = timestamp;
                 p->current->state_since = timestamp;
         }
@@ -682,6 +714,249 @@ static void end_sample_processing(struct timechart *tchart)
         }
 }
 
+static int pid_begin_io_sample(struct timechart *tchart, int pid, int type,
+                               u64 start, int fd)
+{
+        struct per_pid *p = find_create_pid(tchart, pid);
+        struct per_pidcomm *c = p->current;
+        struct io_sample *sample;
+        struct io_sample *prev;
+
+        if (!c) {
+                c = zalloc(sizeof(*c));
+                if (!c)
+                        return -ENOMEM;
+                p->current = c;
+                c->next = p->all;
+                p->all = c;
+        }
+
+        prev = c->io_samples;
+
+        if (prev && prev->start_time && !prev->end_time) {
+                pr_warning("Skip invalid start event: "
+                           "previous event already started!\n");
+
+                /* remove previous event that has been started,
+                 * we are not sure we will ever get an end for it */
+                c->io_samples = prev->next;
+                free(prev);
+                return 0;
+        }
+
+        sample = zalloc(sizeof(*sample));
+        if (!sample)
+                return -ENOMEM;
+        sample->start_time = start;
+        sample->type = type;
+        sample->fd = fd;
+        sample->next = c->io_samples;
+        c->io_samples = sample;
+
+        if (c->start_time == 0 || c->start_time > start)
+                c->start_time = start;
+
+        return 0;
+}
+
+static int pid_end_io_sample(struct timechart *tchart, int pid, int type,
+                             u64 end, long ret)
+{
+        struct per_pid *p = find_create_pid(tchart, pid);
+        struct per_pidcomm *c = p->current;
+        struct io_sample *sample, *prev;
+
+        if (!c) {
+                pr_warning("Invalid pidcomm!\n");
+                return -1;
+        }
+
+        sample = c->io_samples;
+
+        if (!sample) /* skip partially captured events */
+                return 0;
+
+        if (sample->end_time) {
+                pr_warning("Skip invalid end event: "
+                           "previous event already ended!\n");
+                return 0;
+        }
+
+        if (sample->type != type) {
+                pr_warning("Skip invalid end event: invalid event type!\n");
+                return 0;
+        }
+
+        sample->end_time = end;
+        prev = sample->next;
+
+        /* we want to be able to see small and fast transfers, so make them
+         * at least min_time long, but don't overlap them */
+        if (sample->end_time - sample->start_time < tchart->min_time)
+                sample->end_time = sample->start_time + tchart->min_time;
+        if (prev && sample->start_time < prev->end_time) {
+                if (prev->err) /* try to make errors more visible */
+                        sample->start_time = prev->end_time;
+                else
+                        prev->end_time = sample->start_time;
+        }
+
+        if (ret < 0) {
+                sample->err = ret;
+        } else if (type == IOTYPE_READ || type == IOTYPE_WRITE ||
+                   type == IOTYPE_TX || type == IOTYPE_RX) {
+
+                if ((u64)ret > c->max_bytes)
+                        c->max_bytes = ret;
+
+                c->total_bytes += ret;
+                p->total_bytes += ret;
+                sample->bytes = ret;
+        }
+
+        /* merge two requests to make svg smaller and render-friendly */
+        if (prev &&
+            prev->type == sample->type &&
+            prev->err == sample->err &&
+            prev->fd == sample->fd &&
+            prev->end_time + tchart->merge_dist >= sample->start_time) {
+
+                sample->bytes += prev->bytes;
+                sample->merges += prev->merges + 1;
+
+                sample->start_time = prev->start_time;
+                sample->next = prev->next;
+                free(prev);
+
+                if (!sample->err && sample->bytes > c->max_bytes)
+                        c->max_bytes = sample->bytes;
+        }
+
+        tchart->io_events++;
+
+        return 0;
+}
+
+static int
+process_enter_read(struct timechart *tchart,
+                   struct perf_evsel *evsel,
+                   struct perf_sample *sample)
+{
+        long fd = perf_evsel__intval(evsel, sample, "fd");
+        return pid_begin_io_sample(tchart, sample->tid, IOTYPE_READ,
+                                   sample->time, fd);
+}
+
+static int
+process_exit_read(struct timechart *tchart,
+                  struct perf_evsel *evsel,
+                  struct perf_sample *sample)
+{
+        long ret = perf_evsel__intval(evsel, sample, "ret");
+        return pid_end_io_sample(tchart, sample->tid, IOTYPE_READ,
+                                 sample->time, ret);
+}
+
+static int
+process_enter_write(struct timechart *tchart,
+                    struct perf_evsel *evsel,
+                    struct perf_sample *sample)
+{
+        long fd = perf_evsel__intval(evsel, sample, "fd");
+        return pid_begin_io_sample(tchart, sample->tid, IOTYPE_WRITE,
+                                   sample->time, fd);
+}
+
+static int
+process_exit_write(struct timechart *tchart,
+                   struct perf_evsel *evsel,
+                   struct perf_sample *sample)
+{
+        long ret = perf_evsel__intval(evsel, sample, "ret");
+        return pid_end_io_sample(tchart, sample->tid, IOTYPE_WRITE,
+                                 sample->time, ret);
+}
+
+static int
+process_enter_sync(struct timechart *tchart,
+                   struct perf_evsel *evsel,
+                   struct perf_sample *sample)
+{
+        long fd = perf_evsel__intval(evsel, sample, "fd");
+        return pid_begin_io_sample(tchart, sample->tid, IOTYPE_SYNC,
+                                   sample->time, fd);
+}
+
+static int
+process_exit_sync(struct timechart *tchart,
+                  struct perf_evsel *evsel,
+                  struct perf_sample *sample)
+{
+        long ret = perf_evsel__intval(evsel, sample, "ret");
+        return pid_end_io_sample(tchart, sample->tid, IOTYPE_SYNC,
+                                 sample->time, ret);
+}
+
+static int
+process_enter_tx(struct timechart *tchart,
+                 struct perf_evsel *evsel,
+                 struct perf_sample *sample)
+{
+        long fd = perf_evsel__intval(evsel, sample, "fd");
+        return pid_begin_io_sample(tchart, sample->tid, IOTYPE_TX,
+                                   sample->time, fd);
+}
+
+static int
+process_exit_tx(struct timechart *tchart,
+                struct perf_evsel *evsel,
+                struct perf_sample *sample)
+{
+        long ret = perf_evsel__intval(evsel, sample, "ret");
+        return pid_end_io_sample(tchart, sample->tid, IOTYPE_TX,
+                                 sample->time, ret);
+}
+
+static int
+process_enter_rx(struct timechart *tchart,
+                 struct perf_evsel *evsel,
+                 struct perf_sample *sample)
+{
+        long fd = perf_evsel__intval(evsel, sample, "fd");
+        return pid_begin_io_sample(tchart, sample->tid, IOTYPE_RX,
+                                   sample->time, fd);
+}
+
+static int
+process_exit_rx(struct timechart *tchart,
+                struct perf_evsel *evsel,
+                struct perf_sample *sample)
+{
+        long ret = perf_evsel__intval(evsel, sample, "ret");
+        return pid_end_io_sample(tchart, sample->tid, IOTYPE_RX,
+                                 sample->time, ret);
+}
+
+static int
+process_enter_poll(struct timechart *tchart,
+                   struct perf_evsel *evsel,
+                   struct perf_sample *sample)
+{
+        long fd = perf_evsel__intval(evsel, sample, "fd");
+        return pid_begin_io_sample(tchart, sample->tid, IOTYPE_POLL,
+                                   sample->time, fd);
+}
+
+static int
+process_exit_poll(struct timechart *tchart,
+                  struct perf_evsel *evsel,
+                  struct perf_sample *sample)
+{
+        long ret = perf_evsel__intval(evsel, sample, "ret");
+        return pid_end_io_sample(tchart, sample->tid, IOTYPE_POLL,
+                                 sample->time, ret);
+}
+
 /*
  * Sort the pid datastructure
  */
@@ -852,6 +1127,121 @@ static void draw_cpu_usage(struct timechart *tchart)
         }
 }
 
+static void draw_io_bars(struct timechart *tchart)
+{
+        const char *suf;
+        double bytes;
+        char comm[256];
+        struct per_pid *p;
+        struct per_pidcomm *c;
+        struct io_sample *sample;
+        int Y = 1;
+
+        p = tchart->all_data;
+        while (p) {
+                c = p->all;
+                while (c) {
+                        if (!c->display) {
+                                c->Y = 0;
+                                c = c->next;
+                                continue;
+                        }
+
+                        svg_box(Y, c->start_time, c->end_time, "process3");
+                        sample = c->io_samples;
+                        for (sample = c->io_samples; sample; sample = sample->next) {
+                                double h = (double)sample->bytes / c->max_bytes;
+
+                                if (tchart->skip_eagain &&
+                                    sample->err == -EAGAIN)
+                                        continue;
+
+                                if (sample->err)
+                                        h = 1;
+
+                                if (sample->type == IOTYPE_SYNC)
+                                        svg_fbox(Y,
+                                                sample->start_time,
+                                                sample->end_time,
+                                                1,
+                                                sample->err ? "error" : "sync",
+                                                sample->fd,
+                                                sample->err,
+                                                sample->merges);
+                                else if (sample->type == IOTYPE_POLL)
+                                        svg_fbox(Y,
+                                                sample->start_time,
+                                                sample->end_time,
+                                                1,
+                                                sample->err ? "error" : "poll",
+                                                sample->fd,
+                                                sample->err,
+                                                sample->merges);
+                                else if (sample->type == IOTYPE_READ)
+                                        svg_ubox(Y,
+                                                sample->start_time,
+                                                sample->end_time,
+                                                h,
+                                                sample->err ? "error" : "disk",
+                                                sample->fd,
+                                                sample->err,
+                                                sample->merges);
+                                else if (sample->type == IOTYPE_WRITE)
+                                        svg_lbox(Y,
+                                                sample->start_time,
+                                                sample->end_time,
+                                                h,
+                                                sample->err ? "error" : "disk",
+                                                sample->fd,
+                                                sample->err,
+                                                sample->merges);
+                                else if (sample->type == IOTYPE_RX)
+                                        svg_ubox(Y,
+                                                sample->start_time,
+                                                sample->end_time,
+                                                h,
+                                                sample->err ? "error" : "net",
+                                                sample->fd,
+                                                sample->err,
+                                                sample->merges);
+                                else if (sample->type == IOTYPE_TX)
+                                        svg_lbox(Y,
+                                                sample->start_time,
+                                                sample->end_time,
+                                                h,
+                                                sample->err ? "error" : "net",
+                                                sample->fd,
+                                                sample->err,
+                                                sample->merges);
+                        }
+
+                        suf = "";
+                        bytes = c->total_bytes;
+                        if (bytes > 1024) {
+                                bytes = bytes / 1024;
+                                suf = "K";
+                        }
+                        if (bytes > 1024) {
+                                bytes = bytes / 1024;
+                                suf = "M";
+                        }
+                        if (bytes > 1024) {
+                                bytes = bytes / 1024;
+                                suf = "G";
+                        }
+
+
+                        sprintf(comm, "%s:%i (%3.1f %sbytes)", c->comm ?: "", p->pid, bytes, suf);
+                        svg_text(Y, c->start_time, comm);
+
+                        c->Y = Y;
+                        Y++;
+                        c = c->next;
+                }
+                p = p->next;
+        }
+}
+
 static void draw_process_bars(struct timechart *tchart)
 {
         struct per_pid *p;
@@ -987,9 +1377,6 @@ static int determine_display_tasks(struct timechart *tchart, u64 threshold)
         struct per_pidcomm *c;
         int count = 0;
 
-        if (process_filter)
-                return determine_display_tasks_filtered(tchart);
-
         p = tchart->all_data;
         while (p) {
                 p->display = 0;
@@ -1025,15 +1412,46 @@ static int determine_display_tasks(struct timechart *tchart, u64 threshold)
         return count;
 }
 
+static int determine_display_io_tasks(struct timechart *timechart, u64 threshold)
+{
+        struct per_pid *p;
+        struct per_pidcomm *c;
+        int count = 0;
+
+        p = timechart->all_data;
+        while (p) {
+                /* no exit marker, task kept running to the end */
+                if (p->end_time == 0)
+                        p->end_time = timechart->last_time;
 
+                c = p->all;
 
+                while (c) {
+                        c->display = 0;
+
+                        if (c->total_bytes >= threshold) {
+                                c->display = 1;
+                                count++;
+                        }
+
+                        if (c->end_time == 0)
+                                c->end_time = timechart->last_time;
+
+                        c = c->next;
+                }
+                p = p->next;
+        }
+        return count;
+}
+
+#define BYTES_THRESH (1 * 1024 * 1024)
 #define TIME_THRESH 10000000
 
 static void write_svg_file(struct timechart *tchart, const char *filename)
 {
         u64 i;
         int count;
-        int thresh = TIME_THRESH;
+        int thresh = tchart->io_events ? BYTES_THRESH : TIME_THRESH;
 
         if (tchart->power_only)
                 tchart->proc_num = 0;
@@ -1041,28 +1459,43 @@ static void write_svg_file(struct timechart *tchart, const char *filename)
         /* We'd like to show at least proc_num tasks;
          * be less picky if we have fewer */
         do {
-                count = determine_display_tasks(tchart, thresh);
+                if (process_filter)
+                        count = determine_display_tasks_filtered(tchart);
+                else if (tchart->io_events)
+                        count = determine_display_io_tasks(tchart, thresh);
+                else
+                        count = determine_display_tasks(tchart, thresh);
                 thresh /= 10;
         } while (!process_filter && thresh && count < tchart->proc_num);
 
         if (!tchart->proc_num)
                 count = 0;
 
-        open_svg(filename, tchart->numcpus, count, tchart->first_time, tchart->last_time);
+        if (tchart->io_events) {
+                open_svg(filename, 0, count, tchart->first_time, tchart->last_time);
 
-        svg_time_grid();
-        svg_legenda();
+                svg_time_grid(0.5);
+                svg_io_legenda();
+
+                draw_io_bars(tchart);
+        } else {
+                open_svg(filename, tchart->numcpus, count, tchart->first_time, tchart->last_time);
 
-        for (i = 0; i < tchart->numcpus; i++)
-                svg_cpu_box(i, tchart->max_freq, tchart->turbo_frequency);
+                svg_time_grid(0);
 
-        draw_cpu_usage(tchart);
-        if (tchart->proc_num)
-                draw_process_bars(tchart);
-        if (!tchart->tasks_only)
-                draw_c_p_states(tchart);
-        if (tchart->proc_num)
-                draw_wakeups(tchart);
+                svg_legenda();
+
+                for (i = 0; i < tchart->numcpus; i++)
+                        svg_cpu_box(i, tchart->max_freq, tchart->turbo_frequency);
+
+                draw_cpu_usage(tchart);
+                if (tchart->proc_num)
+                        draw_process_bars(tchart);
+                if (!tchart->tasks_only)
+                        draw_c_p_states(tchart);
+                if (tchart->proc_num)
+                        draw_wakeups(tchart);
+        }
 
         svg_close();
 }
@@ -1110,6 +1543,56 @@ static int __cmd_timechart(struct timechart *tchart, const char *output_name)
                 { "power:power_end",            process_sample_power_end },
                 { "power:power_frequency",      process_sample_power_frequency },
 #endif
+
+                { "syscalls:sys_enter_read",            process_enter_read },
+                { "syscalls:sys_enter_pread64",         process_enter_read },
+                { "syscalls:sys_enter_readv",           process_enter_read },
+                { "syscalls:sys_enter_preadv",          process_enter_read },
+                { "syscalls:sys_enter_write",           process_enter_write },
+                { "syscalls:sys_enter_pwrite64",        process_enter_write },
+                { "syscalls:sys_enter_writev",          process_enter_write },
+                { "syscalls:sys_enter_pwritev",         process_enter_write },
+                { "syscalls:sys_enter_sync",            process_enter_sync },
+                { "syscalls:sys_enter_sync_file_range", process_enter_sync },
+                { "syscalls:sys_enter_fsync",           process_enter_sync },
+                { "syscalls:sys_enter_msync",           process_enter_sync },
+                { "syscalls:sys_enter_recvfrom",        process_enter_rx },
+                { "syscalls:sys_enter_recvmmsg",        process_enter_rx },
+                { "syscalls:sys_enter_recvmsg",         process_enter_rx },
+                { "syscalls:sys_enter_sendto",          process_enter_tx },
+                { "syscalls:sys_enter_sendmsg",         process_enter_tx },
+                { "syscalls:sys_enter_sendmmsg",        process_enter_tx },
+                { "syscalls:sys_enter_epoll_pwait",     process_enter_poll },
+                { "syscalls:sys_enter_epoll_wait",      process_enter_poll },
+                { "syscalls:sys_enter_poll",            process_enter_poll },
+                { "syscalls:sys_enter_ppoll",           process_enter_poll },
+                { "syscalls:sys_enter_pselect6",        process_enter_poll },
+                { "syscalls:sys_enter_select",          process_enter_poll },
+
+                { "syscalls:sys_exit_read",             process_exit_read },
+                { "syscalls:sys_exit_pread64",          process_exit_read },
+                { "syscalls:sys_exit_readv",            process_exit_read },
+                { "syscalls:sys_exit_preadv",           process_exit_read },
+                { "syscalls:sys_exit_write",            process_exit_write },
+                { "syscalls:sys_exit_pwrite64",         process_exit_write },
+                { "syscalls:sys_exit_writev",           process_exit_write },
+                { "syscalls:sys_exit_pwritev",          process_exit_write },
+                { "syscalls:sys_exit_sync",             process_exit_sync },
+                { "syscalls:sys_exit_sync_file_range",  process_exit_sync },
+                { "syscalls:sys_exit_fsync",            process_exit_sync },
+                { "syscalls:sys_exit_msync",            process_exit_sync },
+                { "syscalls:sys_exit_recvfrom",         process_exit_rx },
+                { "syscalls:sys_exit_recvmmsg",         process_exit_rx },
+                { "syscalls:sys_exit_recvmsg",          process_exit_rx },
+                { "syscalls:sys_exit_sendto",           process_exit_tx },
+                { "syscalls:sys_exit_sendmsg",          process_exit_tx },
+                { "syscalls:sys_exit_sendmmsg",         process_exit_tx },
+                { "syscalls:sys_exit_epoll_pwait",      process_exit_poll },
+                { "syscalls:sys_exit_epoll_wait",       process_exit_poll },
+                { "syscalls:sys_exit_poll",             process_exit_poll },
+                { "syscalls:sys_exit_ppoll",            process_exit_poll },
+                { "syscalls:sys_exit_pselect6",         process_exit_poll },
+                { "syscalls:sys_exit_select",           process_exit_poll },
         };
         struct perf_data_file file = {
                 .path = input_name,
@@ -1154,6 +1637,139 @@ out_delete:
         return ret;
 }
 
+static int timechart__io_record(int argc, const char **argv)
+{
+        unsigned int rec_argc, i;
+        const char **rec_argv;
+        const char **p;
+        char *filter = NULL;
+
+        const char * const common_args[] = {
+                "record", "-a", "-R", "-c", "1",
+        };
+        unsigned int common_args_nr = ARRAY_SIZE(common_args);
+
+        const char * const disk_events[] = {
+                "syscalls:sys_enter_read",
+                "syscalls:sys_enter_pread64",
+                "syscalls:sys_enter_readv",
+                "syscalls:sys_enter_preadv",
+                "syscalls:sys_enter_write",
+                "syscalls:sys_enter_pwrite64",
+                "syscalls:sys_enter_writev",
+                "syscalls:sys_enter_pwritev",
+                "syscalls:sys_enter_sync",
+                "syscalls:sys_enter_sync_file_range",
+                "syscalls:sys_enter_fsync",
+                "syscalls:sys_enter_msync",
+
+                "syscalls:sys_exit_read",
+                "syscalls:sys_exit_pread64",
+                "syscalls:sys_exit_readv",
+                "syscalls:sys_exit_preadv",
+                "syscalls:sys_exit_write",
+                "syscalls:sys_exit_pwrite64",
+                "syscalls:sys_exit_writev",
+                "syscalls:sys_exit_pwritev",
+                "syscalls:sys_exit_sync",
+                "syscalls:sys_exit_sync_file_range",
+                "syscalls:sys_exit_fsync",
+                "syscalls:sys_exit_msync",
+        };
+        unsigned int disk_events_nr = ARRAY_SIZE(disk_events);
+
+        const char * const net_events[] = {
+                "syscalls:sys_enter_recvfrom",
+                "syscalls:sys_enter_recvmmsg",
+                "syscalls:sys_enter_recvmsg",
+                "syscalls:sys_enter_sendto",
+                "syscalls:sys_enter_sendmsg",
+                "syscalls:sys_enter_sendmmsg",
+
+                "syscalls:sys_exit_recvfrom",
+                "syscalls:sys_exit_recvmmsg",
+                "syscalls:sys_exit_recvmsg",
+                "syscalls:sys_exit_sendto",
+                "syscalls:sys_exit_sendmsg",
+                "syscalls:sys_exit_sendmmsg",
+        };
+        unsigned int net_events_nr = ARRAY_SIZE(net_events);
+
+        const char * const poll_events[] = {
+                "syscalls:sys_enter_epoll_pwait",
+                "syscalls:sys_enter_epoll_wait",
+                "syscalls:sys_enter_poll",
+                "syscalls:sys_enter_ppoll",
+                "syscalls:sys_enter_pselect6",
+                "syscalls:sys_enter_select",
+
+                "syscalls:sys_exit_epoll_pwait",
+                "syscalls:sys_exit_epoll_wait",
+                "syscalls:sys_exit_poll",
+                "syscalls:sys_exit_ppoll",
+                "syscalls:sys_exit_pselect6",
+                "syscalls:sys_exit_select",
+        };
+        unsigned int poll_events_nr = ARRAY_SIZE(poll_events);
+
+        rec_argc = common_args_nr +
+                disk_events_nr * 4 +
+                net_events_nr * 4 +
+                poll_events_nr * 4 +
+                argc;
+        rec_argv = calloc(rec_argc + 1, sizeof(char *));
+
+        if (rec_argv == NULL)
+                return -ENOMEM;
+
+        if (asprintf(&filter, "common_pid != %d", getpid()) < 0)
+                return -ENOMEM;
+
+        p = rec_argv;
+        for (i = 0; i < common_args_nr; i++)
+                *p++ = strdup(common_args[i]);
+
+        for (i = 0; i < disk_events_nr; i++) {
+                if (!is_valid_tracepoint(disk_events[i])) {
+                        rec_argc -= 4;
+                        continue;
+                }
+
+                *p++ = "-e";
+                *p++ = strdup(disk_events[i]);
+                *p++ = "--filter";
+                *p++ = filter;
+        }
+        for (i = 0; i < net_events_nr; i++) {
+                if (!is_valid_tracepoint(net_events[i])) {
+                        rec_argc -= 4;
+                        continue;
+                }
+
+                *p++ = "-e";
+                *p++ = strdup(net_events[i]);
+                *p++ = "--filter";
+                *p++ = filter;
+        }
+        for (i = 0; i < poll_events_nr; i++) {
+                if (!is_valid_tracepoint(poll_events[i])) {
+                        rec_argc -= 4;
+                        continue;
+                }
+
+                *p++ = "-e";
+                *p++ = strdup(poll_events[i]);
+                *p++ = "--filter";
+                *p++ = filter;
+        }
+
+        for (i = 0; i < (unsigned int)argc; i++)
+                *p++ = argv[i];
+
+        return cmd_record(rec_argc, rec_argv, NULL);
+}
+
+
 static int timechart__record(struct timechart *tchart, int argc, const char **argv)
 {
         unsigned int rec_argc, i, j;
@@ -1270,6 +1886,30 @@ parse_highlight(const struct option *opt __maybe_unused, const char *arg,
         return 0;
 }
 
+static int
+parse_time(const struct option *opt, const char *arg, int __maybe_unused unset)
+{
+        char unit = 'n';
+        u64 *value = opt->value;
+
+        if (sscanf(arg, "%" PRIu64 "%cs", value, &unit) > 0) {
+                switch (unit) {
+                case 'm':
+                        *value *= 1000000;
+                        break;
+                case 'u':
+                        *value *= 1000;
+                        break;
+                case 'n':
+                        break;
+                default:
+                        return -1;
+                }
+        }
+
+        return 0;
+}
+
 int cmd_timechart(int argc, const char **argv,
                   const char *prefix __maybe_unused)
 {
@@ -1282,6 +1922,8 @@ int cmd_timechart(int argc, const char **argv,
                         .ordered_samples = true,
                 },
                 .proc_num = 15,
+                .min_time = 1000000,
+                .merge_dist = 1000,
         };
         const char *output_name = "output.svg";
         const struct option timechart_options[] = {
@@ -1303,6 +1945,14 @@ int cmd_timechart(int argc, const char **argv,
                     "min. number of tasks to print"),
         OPT_BOOLEAN('t', "topology", &tchart.topology,
                     "sort CPUs according to topology"),
+        OPT_BOOLEAN(0, "io-skip-eagain", &tchart.skip_eagain,
+                    "skip EAGAIN errors"),
+        OPT_CALLBACK(0, "io-min-time", &tchart.min_time, "time",
+                     "all IO faster than min-time will visually appear longer",
+                     parse_time),
+        OPT_CALLBACK(0, "io-merge-dist", &tchart.merge_dist, "time",
+                     "merge events that are merge-dist us apart",
+                     parse_time),
         OPT_END()
         };
         const char * const timechart_usage[] = {
@@ -1314,6 +1964,8 @@ int cmd_timechart(int argc, const char **argv,
         OPT_BOOLEAN('P', "power-only", &tchart.power_only, "output power data only"),
         OPT_BOOLEAN('T', "tasks-only", &tchart.tasks_only,
                     "output processes data only"),
+        OPT_BOOLEAN('I', "io-only", &tchart.io_only,
+                    "record only IO data"),
         OPT_BOOLEAN('g', "callchain", &tchart.with_backtrace, "record callchain"),
         OPT_END()
         };
@@ -1340,7 +1992,10 @@ int cmd_timechart(int argc, const char **argv,
                         return -1;
                 }
 
-                return timechart__record(&tchart, argc, argv);
+                if (tchart.io_only)
+                        return timechart__io_record(argc, argv);
+                else
+                        return timechart__record(&tchart, argc, argv);
         } else if (argc)
                 usage_with_options(timechart_usage, timechart_options);
 
diff --git a/tools/perf/util/svghelper.c b/tools/perf/util/svghelper.c
index 6a0a13d07a28..283d3e73e2f2 100644
--- a/tools/perf/util/svghelper.c
+++ b/tools/perf/util/svghelper.c
@@ -30,6 +30,7 @@ static u64 turbo_frequency, max_freq;
 
 #define SLOT_MULT 30.0
 #define SLOT_HEIGHT 25.0
+#define SLOT_HALF (SLOT_HEIGHT / 2)
 
 int svg_page_width = 1000;
 u64 svg_highlight;
@@ -114,8 +115,14 @@ void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end)
         fprintf(svgfile, "      rect          { stroke-width: 1; }\n");
         fprintf(svgfile, "      rect.process  { fill:rgb(180,180,180); fill-opacity:0.9; stroke-width:1;   stroke:rgb(  0,  0,  0); } \n");
         fprintf(svgfile, "      rect.process2 { fill:rgb(180,180,180); fill-opacity:0.9; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
+        fprintf(svgfile, "      rect.process3 { fill:rgb(180,180,180); fill-opacity:0.5; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
         fprintf(svgfile, "      rect.sample   { fill:rgb(  0,  0,255); fill-opacity:0.8; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
         fprintf(svgfile, "      rect.sample_hi{ fill:rgb(255,128,  0); fill-opacity:0.8; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
+        fprintf(svgfile, "      rect.error    { fill:rgb(255,  0,  0); fill-opacity:0.5; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
+        fprintf(svgfile, "      rect.net      { fill:rgb(  0,128,  0); fill-opacity:0.5; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
+        fprintf(svgfile, "      rect.disk     { fill:rgb(  0,  0,255); fill-opacity:0.5; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
+        fprintf(svgfile, "      rect.sync     { fill:rgb(128,128,  0); fill-opacity:0.5; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
+        fprintf(svgfile, "      rect.poll     { fill:rgb(  0,128,128); fill-opacity:0.2; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
         fprintf(svgfile, "      rect.blocked  { fill:rgb(255,  0,  0); fill-opacity:0.5; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
         fprintf(svgfile, "      rect.waiting  { fill:rgb(224,214,  0); fill-opacity:0.8; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
         fprintf(svgfile, "      rect.WAITING  { fill:rgb(255,214, 48); fill-opacity:0.6; stroke-width:0;   stroke:rgb(  0,  0,  0); } \n");
@@ -132,12 +139,81 @@ void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end)
         fprintf(svgfile, "    ]]>\n   </style>\n</defs>\n");
 }
 
+static double normalize_height(double height)
+{
+        if (height < 0.25)
+                return 0.25;
+        else if (height < 0.50)
+                return 0.50;
+        else if (height < 0.75)
+                return 0.75;
+        else
+                return 0.100;
+}
+
+void svg_ubox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges)
+{
+        double w = time2pixels(end) - time2pixels(start);
+        height = normalize_height(height);
+
+        if (!svgfile)
+                return;
+
+        fprintf(svgfile, "<g>\n");
+        fprintf(svgfile, "<title>fd=%d error=%d merges=%d</title>\n", fd, err, merges);
+        fprintf(svgfile, "<rect x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\" class=\"%s\"/>\n",
+                time2pixels(start),
+                w,
+                Yslot * SLOT_MULT,
+                SLOT_HALF * height,
+                type);
+        fprintf(svgfile, "</g>\n");
+}
+
+void svg_lbox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges)
+{
+        double w = time2pixels(end) - time2pixels(start);
+        height = normalize_height(height);
+
+        if (!svgfile)
+                return;
+
+        fprintf(svgfile, "<g>\n");
+        fprintf(svgfile, "<title>fd=%d error=%d merges=%d</title>\n", fd, err, merges);
+        fprintf(svgfile, "<rect x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\" class=\"%s\"/>\n",
+                time2pixels(start),
+                w,
+                Yslot * SLOT_MULT + SLOT_HEIGHT - SLOT_HALF * height,
+                SLOT_HALF * height,
+                type);
+        fprintf(svgfile, "</g>\n");
+}
+
+void svg_fbox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges)
+{
+        double w = time2pixels(end) - time2pixels(start);
+        height = normalize_height(height);
+
+        if (!svgfile)
+                return;
+
+        fprintf(svgfile, "<g>\n");
+        fprintf(svgfile, "<title>fd=%d error=%d merges=%d</title>\n", fd, err, merges);
+        fprintf(svgfile, "<rect x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\" class=\"%s\"/>\n",
+                time2pixels(start),
+                w,
+                Yslot * SLOT_MULT + SLOT_HEIGHT - SLOT_HEIGHT * height,
+                SLOT_HEIGHT * height,
+                type);
+        fprintf(svgfile, "</g>\n");
+}
+
 void svg_box(int Yslot, u64 start, u64 end, const char *type)
 {
         if (!svgfile)
                 return;
 
-        fprintf(svgfile, "<rect x=\"%4.8f\" width=\"%4.8f\" y=\"%4.1f\" height=\"%4.1f\" class=\"%s\"/>\n",
+        fprintf(svgfile, "<rect x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\" class=\"%s\"/>\n",
                 time2pixels(start), time2pixels(end)-time2pixels(start), Yslot * SLOT_MULT, SLOT_HEIGHT, type);
 }
 
@@ -174,7 +250,7 @@ void svg_running(int Yslot, int cpu, u64 start, u64 end, const char *backtrace)
                 cpu, time_to_string(end - start));
         if (backtrace)
                 fprintf(svgfile, "<desc>Switched because:\n%s</desc>\n", backtrace);
-        fprintf(svgfile, "<rect x=\"%4.8f\" width=\"%4.8f\" y=\"%4.1f\" height=\"%4.1f\" class=\"%s\"/>\n",
+        fprintf(svgfile, "<rect x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\" class=\"%s\"/>\n",
                 time2pixels(start), time2pixels(end)-time2pixels(start), Yslot * SLOT_MULT, SLOT_HEIGHT,
                 type);
 
@@ -186,7 +262,7 @@ void svg_running(int Yslot, int cpu, u64 start, u64 end, const char *backtrace)
         text_size = round_text_size(text_size);
 
         if (text_size > MIN_TEXT_SIZE)
-                fprintf(svgfile, "<text x=\"%1.8f\" y=\"%1.8f\" font-size=\"%1.8fpt\">%i</text>\n",
+                fprintf(svgfile, "<text x=\"%.8f\" y=\"%.8f\" font-size=\"%.8fpt\">%i</text>\n",
                         time2pixels(start), Yslot *  SLOT_MULT + SLOT_HEIGHT - 1, text_size,  cpu + 1);
 
         fprintf(svgfile, "</g>\n");
@@ -202,10 +278,10 @@ static char *time_to_string(u64 duration)
                 return text;
 
         if (duration < 1000 * 1000) { /* less than 1 msec */
-                sprintf(text, "%4.1f us", duration / 1000.0);
+                sprintf(text, "%.1f us", duration / 1000.0);
                 return text;
         }
-        sprintf(text, "%4.1f ms", duration / 1000.0 / 1000);
+        sprintf(text, "%.1f ms", duration / 1000.0 / 1000);
 
         return text;
 }
@@ -233,14 +309,14 @@ void svg_waiting(int Yslot, int cpu, u64 start, u64 end, const char *backtrace)
 
         font_size = round_text_size(font_size);
 
-        fprintf(svgfile, "<g transform=\"translate(%4.8f,%4.8f)\">\n", time2pixels(start), Yslot * SLOT_MULT);
+        fprintf(svgfile, "<g transform=\"translate(%.8f,%.8f)\">\n", time2pixels(start), Yslot * SLOT_MULT);
         fprintf(svgfile, "<title>#%d waiting %s</title>\n", cpu, time_to_string(end - start));
         if (backtrace)
                 fprintf(svgfile, "<desc>Waiting on:\n%s</desc>\n", backtrace);
-        fprintf(svgfile, "<rect x=\"0\" width=\"%4.8f\" y=\"0\" height=\"%4.1f\" class=\"%s\"/>\n",
+        fprintf(svgfile, "<rect x=\"0\" width=\"%.8f\" y=\"0\" height=\"%.1f\" class=\"%s\"/>\n",
                 time2pixels(end)-time2pixels(start), SLOT_HEIGHT, style);
         if (font_size > MIN_TEXT_SIZE)
-                fprintf(svgfile, "<text transform=\"rotate(90)\" font-size=\"%1.8fpt\"> %s</text>\n",
+                fprintf(svgfile, "<text transform=\"rotate(90)\" font-size=\"%.8fpt\"> %s</text>\n",
                         font_size, text);
         fprintf(svgfile, "</g>\n");
 }
@@ -289,16 +365,16 @@ void svg_cpu_box(int cpu, u64 __max_freq, u64 __turbo_freq)
 
         fprintf(svgfile, "<g>\n");
 
-        fprintf(svgfile, "<rect x=\"%4.8f\" width=\"%4.8f\" y=\"%4.1f\" height=\"%4.1f\" class=\"cpu\"/>\n",
+        fprintf(svgfile, "<rect x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\" class=\"cpu\"/>\n",
                 time2pixels(first_time),
                 time2pixels(last_time)-time2pixels(first_time),
                 cpu2y(cpu), SLOT_MULT+SLOT_HEIGHT);
 
         sprintf(cpu_string, "CPU %i", (int)cpu);
-        fprintf(svgfile, "<text x=\"%4.8f\" y=\"%4.8f\">%s</text>\n",
+        fprintf(svgfile, "<text x=\"%.8f\" y=\"%.8f\">%s</text>\n",
                 10+time2pixels(first_time), cpu2y(cpu) + SLOT_HEIGHT/2, cpu_string);
 
-        fprintf(svgfile, "<text transform=\"translate(%4.8f,%4.8f)\" font-size=\"1.25pt\">%s</text>\n",
+        fprintf(svgfile, "<text transform=\"translate(%.8f,%.8f)\" font-size=\"1.25pt\">%s</text>\n",
                 10+time2pixels(first_time), cpu2y(cpu) + SLOT_MULT + SLOT_HEIGHT - 4, cpu_model());
 
         fprintf(svgfile, "</g>\n");
@@ -319,11 +395,11 @@ void svg_process(int cpu, u64 start, u64 end, int pid, const char *name, const c
         else
                 type = "sample";
 
-        fprintf(svgfile, "<g transform=\"translate(%4.8f,%4.8f)\">\n", time2pixels(start), cpu2y(cpu));
+        fprintf(svgfile, "<g transform=\"translate(%.8f,%.8f)\">\n", time2pixels(start), cpu2y(cpu));
         fprintf(svgfile, "<title>%d %s running %s</title>\n", pid, name, time_to_string(end - start));
         if (backtrace)
                 fprintf(svgfile, "<desc>Switched because:\n%s</desc>\n", backtrace);
-        fprintf(svgfile, "<rect x=\"0\" width=\"%4.8f\" y=\"0\" height=\"%4.1f\" class=\"%s\"/>\n",
+        fprintf(svgfile, "<rect x=\"0\" width=\"%.8f\" y=\"0\" height=\"%.1f\" class=\"%s\"/>\n",
                 time2pixels(end)-time2pixels(start), SLOT_MULT+SLOT_HEIGHT, type);
         width = time2pixels(end)-time2pixels(start);
         if (width > 6)
@@ -332,7 +408,7 @@ void svg_process(int cpu, u64 start, u64 end, int pid, const char *name, const c
         width = round_text_size(width);
 
         if (width > MIN_TEXT_SIZE)
-                fprintf(svgfile, "<text transform=\"rotate(90)\" font-size=\"%3.8fpt\">%s</text>\n",
+                fprintf(svgfile, "<text transform=\"rotate(90)\" font-size=\"%.8fpt\">%s</text>\n",
                         width, name);
 
         fprintf(svgfile, "</g>\n");
@@ -353,7 +429,7 @@ void svg_cstate(int cpu, u64 start, u64 end, int type)
                 type = 6;
         sprintf(style, "c%i", type);
 
-        fprintf(svgfile, "<rect class=\"%s\" x=\"%4.8f\" width=\"%4.8f\" y=\"%4.1f\" height=\"%4.1f\"/>\n",
+        fprintf(svgfile, "<rect class=\"%s\" x=\"%.8f\" width=\"%.8f\" y=\"%.1f\" height=\"%.1f\"/>\n",
                 style,
                 time2pixels(start), time2pixels(end)-time2pixels(start),
                 cpu2y(cpu), SLOT_MULT+SLOT_HEIGHT);
@@ -365,7 +441,7 @@ void svg_cstate(int cpu, u64 start, u64 end, int type)
         width = round_text_size(width);
 
         if (width > MIN_TEXT_SIZE)
-                fprintf(svgfile, "<text x=\"%4.8f\" y=\"%4.8f\" font-size=\"%3.8fpt\">C%i</text>\n",
+                fprintf(svgfile, "<text x=\"%.8f\" y=\"%.8f\" font-size=\"%.8fpt\">C%i</text>\n",
                         time2pixels(start), cpu2y(cpu)+width, width, type);
 
         fprintf(svgfile, "</g>\n");
@@ -407,9 +483,9 @@ void svg_pstate(int cpu, u64 start, u64 end, u64 freq)
         if (max_freq)
                 height = freq * 1.0 / max_freq * (SLOT_HEIGHT + SLOT_MULT);
         height = 1 + cpu2y(cpu) + SLOT_MULT + SLOT_HEIGHT - height;
-        fprintf(svgfile, "<line x1=\"%4.8f\" x2=\"%4.8f\" y1=\"%4.1f\" y2=\"%4.1f\" class=\"pstate\"/>\n",
+        fprintf(svgfile, "<line x1=\"%.8f\" x2=\"%.8f\" y1=\"%.1f\" y2=\"%.1f\" class=\"pstate\"/>\n",
                 time2pixels(start), time2pixels(end), height, height);
-        fprintf(svgfile, "<text x=\"%4.8f\" y=\"%4.8f\" font-size=\"0.25pt\">%s</text>\n",
+        fprintf(svgfile, "<text x=\"%.8f\" y=\"%.8f\" font-size=\"0.25pt\">%s</text>\n",
                 time2pixels(start), height+0.9, HzToHuman(freq));
 
         fprintf(svgfile, "</g>\n");
@@ -435,32 +511,32 @@ void svg_partial_wakeline(u64 start, int row1, char *desc1, int row2, char *desc
 
         if (row1 < row2) {
                 if (row1) {
-                        fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%4.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
+                        fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
                                 time2pixels(start), row1 * SLOT_MULT + SLOT_HEIGHT,  time2pixels(start), row1 * SLOT_MULT + SLOT_HEIGHT + SLOT_MULT/32);
                         if (desc2)
-                                fprintf(svgfile, "<g transform=\"translate(%4.8f,%4.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &gt;</text></g>\n",
+                                fprintf(svgfile, "<g transform=\"translate(%.8f,%.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &gt;</text></g>\n",
                                         time2pixels(start), row1 * SLOT_MULT + SLOT_HEIGHT + SLOT_HEIGHT/48, desc2);
                 }
                 if (row2) {
-                        fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%4.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
+                        fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
                                 time2pixels(start), row2 * SLOT_MULT - SLOT_MULT/32,  time2pixels(start), row2 * SLOT_MULT);
                         if (desc1)
-                                fprintf(svgfile, "<g transform=\"translate(%4.8f,%4.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &gt;</text></g>\n",
+                                fprintf(svgfile, "<g transform=\"translate(%.8f,%.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &gt;</text></g>\n",
                                         time2pixels(start), row2 * SLOT_MULT - SLOT_MULT/32, desc1);
                 }
         } else {
                 if (row2) {
-                        fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%4.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
+                        fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
                                 time2pixels(start), row2 * SLOT_MULT + SLOT_HEIGHT,  time2pixels(start), row2 * SLOT_MULT + SLOT_HEIGHT + SLOT_MULT/32);
                         if (desc1)
-                                fprintf(svgfile, "<g transform=\"translate(%4.8f,%4.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &lt;</text></g>\n",
+                                fprintf(svgfile, "<g transform=\"translate(%.8f,%.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &lt;</text></g>\n",
                                         time2pixels(start), row2 * SLOT_MULT + SLOT_HEIGHT + SLOT_MULT/48, desc1);
                 }
                 if (row1) {
-                        fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%4.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
+                        fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
                                 time2pixels(start), row1 * SLOT_MULT - SLOT_MULT/32,  time2pixels(start), row1 * SLOT_MULT);
                         if (desc2)
-                                fprintf(svgfile, "<g transform=\"translate(%4.8f,%4.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &lt;</text></g>\n",
+                                fprintf(svgfile, "<g transform=\"translate(%.8f,%.8f)\"><text transform=\"rotate(90)\" font-size=\"0.02pt\">%s &lt;</text></g>\n",
                                         time2pixels(start), row1 * SLOT_MULT - SLOT_HEIGHT/32, desc2);
                 }
         }
@@ -468,7 +544,7 @@ void svg_partial_wakeline(u64 start, int row1, char *desc1, int row2, char *desc
         if (row2 > row1)
                 height += SLOT_HEIGHT;
         if (row1)
-                fprintf(svgfile, "<circle  cx=\"%4.8f\" cy=\"%4.2f\" r = \"0.01\"  style=\"fill:rgb(32,255,32)\"/>\n",
+                fprintf(svgfile, "<circle  cx=\"%.8f\" cy=\"%.2f\" r = \"0.01\"  style=\"fill:rgb(32,255,32)\"/>\n",
                         time2pixels(start), height);
 
         fprintf(svgfile, "</g>\n");
@@ -488,16 +564,16 @@ void svg_wakeline(u64 start, int row1, int row2, const char *backtrace)
                 fprintf(svgfile, "<desc>%s</desc>\n", backtrace);
 
         if (row1 < row2)
-                fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%4.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
+                fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
                         time2pixels(start), row1 * SLOT_MULT + SLOT_HEIGHT,  time2pixels(start), row2 * SLOT_MULT);
         else
-                fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%4.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
+                fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%.2f\" style=\"stroke:rgb(32,255,32);stroke-width:0.009\"/>\n",
                         time2pixels(start), row2 * SLOT_MULT + SLOT_HEIGHT,  time2pixels(start), row1 * SLOT_MULT);
 
         height = row1 * SLOT_MULT;
         if (row2 > row1)
                 height += SLOT_HEIGHT;
-        fprintf(svgfile, "<circle  cx=\"%4.8f\" cy=\"%4.2f\" r = \"0.01\"  style=\"fill:rgb(32,255,32)\"/>\n",
+        fprintf(svgfile, "<circle  cx=\"%.8f\" cy=\"%.2f\" r = \"0.01\"  style=\"fill:rgb(32,255,32)\"/>\n",
                         time2pixels(start), height);
 
         fprintf(svgfile, "</g>\n");
@@ -515,9 +591,9 @@ void svg_interrupt(u64 start, int row, const char *backtrace)
         if (backtrace)
                 fprintf(svgfile, "<desc>%s</desc>\n", backtrace);
 
-        fprintf(svgfile, "<circle  cx=\"%4.8f\" cy=\"%4.2f\" r = \"0.01\"  style=\"fill:rgb(255,128,128)\"/>\n",
+        fprintf(svgfile, "<circle  cx=\"%.8f\" cy=\"%.2f\" r = \"0.01\"  style=\"fill:rgb(255,128,128)\"/>\n",
                         time2pixels(start), row * SLOT_MULT);
-        fprintf(svgfile, "<circle  cx=\"%4.8f\" cy=\"%4.2f\" r = \"0.01\"  style=\"fill:rgb(255,128,128)\"/>\n",
+        fprintf(svgfile, "<circle  cx=\"%.8f\" cy=\"%.2f\" r = \"0.01\"  style=\"fill:rgb(255,128,128)\"/>\n",
                         time2pixels(start), row * SLOT_MULT + SLOT_HEIGHT);
 
         fprintf(svgfile, "</g>\n");
@@ -528,7 +604,7 @@ void svg_text(int Yslot, u64 start, const char *text)
         if (!svgfile)
                 return;
 
-        fprintf(svgfile, "<text x=\"%4.8f\" y=\"%4.8f\">%s</text>\n",
+        fprintf(svgfile, "<text x=\"%.8f\" y=\"%.8f\">%s</text>\n",
                 time2pixels(start), Yslot * SLOT_MULT+SLOT_HEIGHT/2, text);
 }
 
@@ -537,12 +613,26 @@ static void svg_legenda_box(int X, const char *text, const char *style)
         double boxsize;
         boxsize = SLOT_HEIGHT / 2;
 
-        fprintf(svgfile, "<rect x=\"%i\" width=\"%4.8f\" y=\"0\" height=\"%4.1f\" class=\"%s\"/>\n",
+        fprintf(svgfile, "<rect x=\"%i\" width=\"%.8f\" y=\"0\" height=\"%.1f\" class=\"%s\"/>\n",
                 X, boxsize, boxsize, style);
-        fprintf(svgfile, "<text transform=\"translate(%4.8f, %4.8f)\" font-size=\"%4.8fpt\">%s</text>\n",
+        fprintf(svgfile, "<text transform=\"translate(%.8f, %.8f)\" font-size=\"%.8fpt\">%s</text>\n",
                 X + boxsize + 5, boxsize, 0.8 * boxsize, text);
 }
 
+void svg_io_legenda(void)
+{
+        if (!svgfile)
+                return;
+
+        fprintf(svgfile, "<g>\n");
+        svg_legenda_box(0,      "Disk", "disk");
+        svg_legenda_box(100,    "Network", "net");
+        svg_legenda_box(200,    "Sync", "sync");
+        svg_legenda_box(300,    "Poll", "poll");
+        svg_legenda_box(400,    "Error", "error");
+        fprintf(svgfile, "</g>\n");
+}
+
 void svg_legenda(void)
 {
         if (!svgfile)
@@ -559,7 +649,7 @@ void svg_legenda(void)
         fprintf(svgfile, "</g>\n");
 }
 
-void svg_time_grid(void)
+void svg_time_grid(double min_thickness)
 {
         u64 i;
 
@@ -579,8 +669,10 @@ void svg_time_grid(void)
                         color = 128;
                 }
 
-                fprintf(svgfile, "<line x1=\"%4.8f\" y1=\"%4.2f\" x2=\"%4.8f\" y2=\"%" PRIu64 "\" style=\"stroke:rgb(%i,%i,%i);stroke-width:%1.3f\"/>\n",
-                        time2pixels(i), SLOT_MULT/2, time2pixels(i), total_height, color, color, color, thickness);
+                if (thickness >= min_thickness)
+                        fprintf(svgfile, "<line x1=\"%.8f\" y1=\"%.2f\" x2=\"%.8f\" y2=\"%" PRIu64 "\" style=\"stroke:rgb(%i,%i,%i);stroke-width:%.3f\"/>\n",
+                                time2pixels(i), SLOT_MULT/2, time2pixels(i),
+                                total_height, color, color, color, thickness);
 
                 i += 10000000;
         }
diff --git a/tools/perf/util/svghelper.h b/tools/perf/util/svghelper.h
index e3aff5332e30..9292a5291445 100644
--- a/tools/perf/util/svghelper.h
+++ b/tools/perf/util/svghelper.h
@@ -4,6 +4,9 @@
 #include <linux/types.h>
 
 extern void open_svg(const char *filename, int cpus, int rows, u64 start, u64 end);
+extern void svg_ubox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges);
+extern void svg_lbox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges);
+extern void svg_fbox(int Yslot, u64 start, u64 end, double height, const char *type, int fd, int err, int merges);
 extern void svg_box(int Yslot, u64 start, u64 end, const char *type);
 extern void svg_blocked(int Yslot, int cpu, u64 start, u64 end, const char *backtrace);
 extern void svg_running(int Yslot, int cpu, u64 start, u64 end, const char *backtrace);
@@ -16,7 +19,8 @@ extern void svg_cstate(int cpu, u64 start, u64 end, int type);
 extern void svg_pstate(int cpu, u64 start, u64 end, u64 freq);
 
 
-extern void svg_time_grid(void);
+extern void svg_time_grid(double min_thickness);
+extern void svg_io_legenda(void);
 extern void svg_legenda(void);
 extern void svg_wakeline(u64 start, int row1, int row2, const char *backtrace);
 extern void svg_partial_wakeline(u64 start, int row1, char *desc1, int row2, char *desc2, const char *backtrace);