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task IO accounting: provide distinct tgid/tid I/O statistics

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Report per-thread I/O statistics in /proc/pid/task/tid/io and aggregate
parent I/O statistics in /proc/pid/io.  This approach follows the same
model used to account per-process and per-thread CPU times.

As a practial application, this allows for example to quickly find the top
I/O consumer when a process spawns many child threads that perform the
actual I/O work, because the aggregated I/O statistics can always be found
in /proc/pid/io.

[ Oleg Nesterov points out that we should check that the task is still
  alive before we iterate over the threads, but also says that we can do
  that fixup on top of this later.  - Linus ]

Acked-by: Balbir Singh <[email protected]>
Signed-off-by: Andrea Righi <[email protected]>
Cc: Matt Heaton <[email protected]>
Cc: Shailabh Nagar <[email protected]>
Acked-by-with-comments: Oleg Nesterov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Andrea Righi 2008-07-25 01:48:49 -07:00 • committed by Linus Torvalds
commit 297c5d9263
4 changed files with 108 additions and 15 deletions
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84
fs/proc/base.c
View file

@ -2376,29 +2376,82 @@ static int proc_base_fill_cache(struct file *filp, void *dirent,
}
#ifdef CONFIG_TASK_IO_ACCOUNTING
static int proc_pid_io_accounting(struct task_struct *task, char *buffer)
static int do_io_accounting(struct task_struct *task, char *buffer, int whole)
{
u64 rchar, wchar, syscr, syscw;
struct task_io_accounting ioac;
if (!whole) {
rchar = task->rchar;
wchar = task->wchar;
syscr = task->syscr;
syscw = task->syscw;
memcpy(&ioac, &task->ioac, sizeof(ioac));
} else {
unsigned long flags;
struct task_struct *t = task;
rchar = wchar = syscr = syscw = 0;
memset(&ioac, 0, sizeof(ioac));
rcu_read_lock();
do {
rchar += t->rchar;
wchar += t->wchar;
syscr += t->syscr;
syscw += t->syscw;
ioac.read_bytes += t->ioac.read_bytes;
ioac.write_bytes += t->ioac.write_bytes;
ioac.cancelled_write_bytes +=
t->ioac.cancelled_write_bytes;
t = next_thread(t);
} while (t != task);
rcu_read_unlock();
if (lock_task_sighand(task, &flags)) {
struct signal_struct *sig = task->signal;
rchar += sig->rchar;
wchar += sig->wchar;
syscr += sig->syscr;
syscw += sig->syscw;
ioac.read_bytes += sig->ioac.read_bytes;
ioac.write_bytes += sig->ioac.write_bytes;
ioac.cancelled_write_bytes +=
sig->ioac.cancelled_write_bytes;
unlock_task_sighand(task, &flags);
}
}
return sprintf(buffer,
#ifdef CONFIG_TASK_XACCT
"rchar: %llu\n"
"wchar: %llu\n"
"syscr: %llu\n"
"syscw: %llu\n"
#endif
"read_bytes: %llu\n"
"write_bytes: %llu\n"
"cancelled_write_bytes: %llu\n",
#ifdef CONFIG_TASK_XACCT
(unsigned long long)task->rchar,
(unsigned long long)task->wchar,
(unsigned long long)task->syscr,
(unsigned long long)task->syscw,
#endif
(unsigned long long)task->ioac.read_bytes,
(unsigned long long)task->ioac.write_bytes,
(unsigned long long)task->ioac.cancelled_write_bytes);
(unsigned long long)rchar,
(unsigned long long)wchar,
(unsigned long long)syscr,
(unsigned long long)syscw,
(unsigned long long)ioac.read_bytes,
(unsigned long long)ioac.write_bytes,
(unsigned long long)ioac.cancelled_write_bytes);
}
#endif
static int proc_tid_io_accounting(struct task_struct *task, char *buffer)
{
return do_io_accounting(task, buffer, 0);
}
static int proc_tgid_io_accounting(struct task_struct *task, char *buffer)
{
return do_io_accounting(task, buffer, 1);
}
#endif /* CONFIG_TASK_IO_ACCOUNTING */
/*
* Thread groups
@ -2470,7 +2523,7 @@ static const struct pid_entry tgid_base_stuff[] = {
REG("coredump_filter", S_IRUGO|S_IWUSR, coredump_filter),
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
INF("io", S_IRUGO, pid_io_accounting),
INF("io", S_IRUGO, tgid_io_accounting),
#endif
};
@ -2797,6 +2850,9 @@ static const struct pid_entry tid_base_stuff[] = {
#ifdef CONFIG_FAULT_INJECTION
REG("make-it-fail", S_IRUGO|S_IWUSR, fault_inject),
#endif
#ifdef CONFIG_TASK_IO_ACCOUNTING
INF("io", S_IRUGO, tid_io_accounting),
#endif
};
static int proc_tid_base_readdir(struct file * filp,