task IO accounting: move all IO statistics in struct task_io_accounting

Simplify the code of include/linux/task_io_accounting.h.

It is also more reasonable to have all the task i/o-related statistics in a
single struct (task_io_accounting).

Signed-off-by: Andrea Righi <righi.andrea@gmail.com>
Signed-off-by: Oleg Nesterov <oleg@tv-sign.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

5 files changed, 44 insertions, 57 deletions

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3d94906c7aa..01ed610f9b8 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2403,7 +2403,7 @@ static int proc_base_fill_cache(struct file *filp, void *dirent,
 #ifdef CONFIG_TASK_IO_ACCOUNTING
 static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
 {
-        struct proc_io_accounting acct = task->ioac;
+        struct task_io_accounting acct = task->ioac;
         unsigned long flags;
 
         if (whole && lock_task_sighand(task, &flags)) {
@@ -2423,10 +2423,10 @@ static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
                         "read_bytes: %llu\n"
                         "write_bytes: %llu\n"
                         "cancelled_write_bytes: %llu\n",
-                        acct.chr.rchar, acct.chr.wchar,
-                        acct.chr.syscr, acct.chr.syscw,
-                        acct.blk.read_bytes, acct.blk.write_bytes,
-                        acct.blk.cancelled_write_bytes);
+                        acct.rchar, acct.wchar,
+                        acct.syscr, acct.syscw,
+                        acct.read_bytes, acct.write_bytes,
+                        acct.cancelled_write_bytes);
 }
 
 static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 034c1ca6b33..5270d449ff9 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -505,7 +505,7 @@ struct signal_struct {
         unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
         unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
         unsigned long inblock, oublock, cinblock, coublock;
-        struct proc_io_accounting ioac;
+        struct task_io_accounting ioac;
 
         /*
          * Cumulative ns of scheduled CPU time for dead threads in the
@@ -1253,7 +1253,7 @@ struct task_struct {
 
         unsigned long ptrace_message;
         siginfo_t *last_siginfo; /* For ptrace use.  */
-        struct proc_io_accounting ioac;
+        struct task_io_accounting ioac;
 #if defined(CONFIG_TASK_XACCT)
         u64 acct_rss_mem1;      /* accumulated rss usage */
         u64 acct_vm_mem1;       /* accumulated virtual memory usage */
@@ -2183,22 +2183,22 @@ extern long sched_group_rt_period(struct task_group *tg);
 #ifdef CONFIG_TASK_XACCT
 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
 {
-        tsk->ioac.chr.rchar += amt;
+        tsk->ioac.rchar += amt;
 }
 
 static inline void add_wchar(struct task_struct *tsk, ssize_t amt)
 {
-        tsk->ioac.chr.wchar += amt;
+        tsk->ioac.wchar += amt;
 }
 
 static inline void inc_syscr(struct task_struct *tsk)
 {
-        tsk->ioac.chr.syscr++;
+        tsk->ioac.syscr++;
 }
 
 static inline void inc_syscw(struct task_struct *tsk)
 {
-        tsk->ioac.chr.syscw++;
+        tsk->ioac.syscw++;
 }
 #else
 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
diff --git a/include/linux/task_io_accounting.h b/include/linux/task_io_accounting.h
index 165390f8b93..5e88afc9a2f 100644
--- a/include/linux/task_io_accounting.h
+++ b/include/linux/task_io_accounting.h
@@ -1,5 +1,5 @@
 /*
- * proc_io_accounting: a structure which is used for recording a single task's
+ * task_io_accounting: a structure which is used for recording a single task's
  * IO statistics.
  *
  * Don't include this header file directly - it is designed to be dragged in via
@@ -8,8 +8,8 @@
  * Blame akpm@osdl.org for all this.
  */
 
+struct task_io_accounting {
 #ifdef CONFIG_TASK_XACCT
-struct task_chr_io_accounting {
         /* bytes read */
         u64 rchar;
         /*  bytes written */
@@ -18,14 +18,9 @@ struct task_chr_io_accounting {
         u64 syscr;
         /* # of write syscalls */
         u64 syscw;
-};
-#else /* CONFIG_TASK_XACCT */
-struct task_chr_io_accounting {
-};
 #endif /* CONFIG_TASK_XACCT */
 
 #ifdef CONFIG_TASK_IO_ACCOUNTING
-struct task_io_accounting {
         /*
          * The number of bytes which this task has caused to be read from
          * storage.
@@ -46,13 +41,5 @@ struct task_io_accounting {
          * information loss in doing that.
          */
         u64 cancelled_write_bytes;
-};
-#else /* CONFIG_TASK_IO_ACCOUNTING */
-struct task_io_accounting {
-};
 #endif /* CONFIG_TASK_IO_ACCOUNTING */
-
-struct proc_io_accounting {
-        struct task_chr_io_accounting chr;
-        struct task_io_accounting blk;
 };
diff --git a/include/linux/task_io_accounting_ops.h b/include/linux/task_io_accounting_ops.h
index e6f958ebe97..4d090f9ee60 100644
--- a/include/linux/task_io_accounting_ops.h
+++ b/include/linux/task_io_accounting_ops.h
@@ -9,7 +9,7 @@
 #ifdef CONFIG_TASK_IO_ACCOUNTING
 static inline void task_io_account_read(size_t bytes)
 {
-        current->ioac.blk.read_bytes += bytes;
+        current->ioac.read_bytes += bytes;
 }
 
 /*
@@ -18,12 +18,12 @@ static inline void task_io_account_read(size_t bytes)
  */
 static inline unsigned long task_io_get_inblock(const struct task_struct *p)
 {
-        return p->ioac.blk.read_bytes >> 9;
+        return p->ioac.read_bytes >> 9;
 }
 
 static inline void task_io_account_write(size_t bytes)
 {
-        current->ioac.blk.write_bytes += bytes;
+        current->ioac.write_bytes += bytes;
 }
 
 /*
@@ -32,25 +32,25 @@ static inline void task_io_account_write(size_t bytes)
  */
 static inline unsigned long task_io_get_oublock(const struct task_struct *p)
 {
-        return p->ioac.blk.write_bytes >> 9;
+        return p->ioac.write_bytes >> 9;
 }
 
 static inline void task_io_account_cancelled_write(size_t bytes)
 {
-        current->ioac.blk.cancelled_write_bytes += bytes;
+        current->ioac.cancelled_write_bytes += bytes;
 }
 
-static inline void task_io_accounting_init(struct proc_io_accounting *ioac)
+static inline void task_io_accounting_init(struct task_io_accounting *ioac)
 {
         memset(ioac, 0, sizeof(*ioac));
 }
 
-static inline void task_blk_io_accounting_add(struct proc_io_accounting *dst,
-                                                struct proc_io_accounting *src)
+static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
+                                                struct task_io_accounting *src)
 {
-        dst->blk.read_bytes += src->blk.read_bytes;
-        dst->blk.write_bytes += src->blk.write_bytes;
-        dst->blk.cancelled_write_bytes += src->blk.cancelled_write_bytes;
+        dst->read_bytes += src->read_bytes;
+        dst->write_bytes += src->write_bytes;
+        dst->cancelled_write_bytes += src->cancelled_write_bytes;
 }
 
 #else
@@ -77,35 +77,35 @@ static inline void task_io_account_cancelled_write(size_t bytes)
 {
 }
 
-static inline void task_io_accounting_init(struct proc_io_accounting *ioac)
+static inline void task_io_accounting_init(struct task_io_accounting *ioac)
 {
 }
 
-static inline void task_blk_io_accounting_add(struct proc_io_accounting *dst,
-                                                struct proc_io_accounting *src)
+static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
+                                                struct task_io_accounting *src)
 {
 }
 
 #endif /* CONFIG_TASK_IO_ACCOUNTING */
 
 #ifdef CONFIG_TASK_XACCT
-static inline void task_chr_io_accounting_add(struct proc_io_accounting *dst,
-                                                struct proc_io_accounting *src)
+static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
+                                                struct task_io_accounting *src)
 {
-        dst->chr.rchar += src->chr.rchar;
-        dst->chr.wchar += src->chr.wchar;
-        dst->chr.syscr += src->chr.syscr;
-        dst->chr.syscw += src->chr.syscw;
+        dst->rchar += src->rchar;
+        dst->wchar += src->wchar;
+        dst->syscr += src->syscr;
+        dst->syscw += src->syscw;
 }
 #else
-static inline void task_chr_io_accounting_add(struct proc_io_accounting *dst,
-                                                struct proc_io_accounting *src)
+static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
+                                                struct task_io_accounting *src)
 {
 }
 #endif /* CONFIG_TASK_XACCT */
 
-static inline void task_io_accounting_add(struct proc_io_accounting *dst,
-                                                struct proc_io_accounting *src)
+static inline void task_io_accounting_add(struct task_io_accounting *dst,
+                                                struct task_io_accounting *src)
 {
         task_chr_io_accounting_add(dst, src);
         task_blk_io_accounting_add(dst, src);
diff --git a/kernel/tsacct.c b/kernel/tsacct.c
index f9cd2561689..8ebcd8532df 100644
--- a/kernel/tsacct.c
+++ b/kernel/tsacct.c
@@ -94,14 +94,14 @@ void xacct_add_tsk(struct taskstats *stats, struct task_struct *p)
                 stats->hiwater_vm    = mm->hiwater_vm * PAGE_SIZE / KB;
                 mmput(mm);
         }
-        stats->read_char        = p->ioac.chr.rchar;
-        stats->write_char       = p->ioac.chr.wchar;
-        stats->read_syscalls    = p->ioac.chr.syscr;
-        stats->write_syscalls   = p->ioac.chr.syscw;
+        stats->read_char        = p->ioac.rchar;
+        stats->write_char       = p->ioac.wchar;
+        stats->read_syscalls    = p->ioac.syscr;
+        stats->write_syscalls   = p->ioac.syscw;
 #ifdef CONFIG_TASK_IO_ACCOUNTING
-        stats->read_bytes       = p->ioac.blk.read_bytes;
-        stats->write_bytes      = p->ioac.blk.write_bytes;
-        stats->cancelled_write_bytes = p->ioac.blk.cancelled_write_bytes;
+        stats->read_bytes       = p->ioac.read_bytes;
+        stats->write_bytes      = p->ioac.write_bytes;
+        stats->cancelled_write_bytes = p->ioac.cancelled_write_bytes;
 #else
         stats->read_bytes       = 0;
         stats->write_bytes      = 0;