Merge tag 'perf-core-for-mingo-4.12-20170314' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core

Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:

New features:

- Add PERF_RECORD_NAMESPACES so that the kernel can record information
  required to associate samples to namespaces, helping in container
  problem characterization.

  Now the 'perf record has a --namespace' option to ask for such info,
  and when present, it can be used, initially, via a new sort order,
  'cgroup_id', allowing histogram entry bucketization by a (device, inode)
  based cgroup identifier (Hari Bathini)

- Add --next option to 'perf sched timehist', showing what is the next
  thread to run (Brendan Gregg)

Fixes:

- Fix segfault with basic block 'cycles' sort dimension (Changbin Du)

- Add c2c to command-list.txt, making it appear in the 'perf help'
  output (Changbin Du)

- Fix zeroing of 'abs_path' variable in the perf hists browser switch
  file code (Changbin Du)

- Hide tips messages when -q/--quiet is given to 'perf report' (Namhyung Kim)

Infrastructure changes:

- Use ref_reloc_sym + offset to setup kretprobes (Naveen Rao)

- Ignore generated files pmu-events/{jevents,pmu-events.c} for git (Changbin Du)

Documentation changes:

- Document +field style argument support for --field option (Changbin Du)

- Clarify 'perf c2c --stats' help message (Namhyung Kim)

Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 42 insertions, 2 deletions

diff --git a/tools/perf/util/thread.c b/tools/perf/util/thread.c
index 74e79d26b421..dcdb87a5d0a1 100644
--- a/tools/perf/util/thread.c
+++ b/tools/perf/util/thread.c
@@ -7,6 +7,7 @@
 #include "thread-stack.h"
 #include "util.h"
 #include "debug.h"
+#include "namespaces.h"
 #include "comm.h"
 #include "unwind.h"
 
@@ -40,6 +41,7 @@ struct thread *thread__new(pid_t pid, pid_t tid)
                 thread->tid = tid;
                 thread->ppid = -1;
                 thread->cpu = -1;
+                INIT_LIST_HEAD(&thread->namespaces_list);
                 INIT_LIST_HEAD(&thread->comm_list);
 
                 comm_str = malloc(32);
@@ -66,7 +68,8 @@ err_thread:
 
 void thread__delete(struct thread *thread)
 {
-        struct comm *comm, *tmp;
+        struct namespaces *namespaces, *tmp_namespaces;
+        struct comm *comm, *tmp_comm;
 
         BUG_ON(!RB_EMPTY_NODE(&thread->rb_node));
 
@@ -76,7 +79,12 @@ void thread__delete(struct thread *thread)
                 map_groups__put(thread->mg);
                 thread->mg = NULL;
         }
-        list_for_each_entry_safe(comm, tmp, &thread->comm_list, list) {
+        list_for_each_entry_safe(namespaces, tmp_namespaces,
+                                 &thread->namespaces_list, list) {
+                list_del(&namespaces->list);
+                namespaces__free(namespaces);
+        }
+        list_for_each_entry_safe(comm, tmp_comm, &thread->comm_list, list) {
                 list_del(&comm->list);
                 comm__free(comm);
         }
@@ -104,6 +112,38 @@ void thread__put(struct thread *thread)
         }
 }
 
+struct namespaces *thread__namespaces(const struct thread *thread)
+{
+        if (list_empty(&thread->namespaces_list))
+                return NULL;
+
+        return list_first_entry(&thread->namespaces_list, struct namespaces, list);
+}
+
+int thread__set_namespaces(struct thread *thread, u64 timestamp,
+                           struct namespaces_event *event)
+{
+        struct namespaces *new, *curr = thread__namespaces(thread);
+
+        new = namespaces__new(event);
+        if (!new)
+                return -ENOMEM;
+
+        list_add(&new->list, &thread->namespaces_list);
+
+        if (timestamp && curr) {
+                /*
+                 * setns syscall must have changed few or all the namespaces
+                 * of this thread. Update end time for the namespaces
+                 * previously used.
+                 */
+                curr = list_next_entry(new, list);
+                curr->end_time = timestamp;
+        }
+
+        return 0;
+}
+
 struct comm *thread__comm(const struct thread *thread)
 {
         if (list_empty(&thread->comm_list))