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authorAndrea Righi <righi.andrea@gmail.com>2008-07-25 04:48:49 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 13:53:47 -0400
commit297c5d92634c809cef23d73e7b2556f2528ff7e2 (patch)
treed006fa29daa24242c64cff3b66dd75fbb0003b0f /include/linux
parent0c18d7a5df82524e634637c3aec24d4cba096442 (diff)
task IO accounting: provide distinct tgid/tid I/O statistics
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 <balbir@linux.vnet.ibm.com> Signed-off-by: Andrea Righi <righi.andrea@gmail.com> Cc: Matt Heaton <matt@hostmonster.com> Cc: Shailabh Nagar <nagar@watson.ibm.com> Acked-by-with-comments: Oleg Nesterov <oleg@tv-sign.ru> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index af780f299c7c..d22ffe06d0eb 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -506,6 +506,10 @@ struct signal_struct {
506 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; 506 unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw;
507 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; 507 unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt;
508 unsigned long inblock, oublock, cinblock, coublock; 508 unsigned long inblock, oublock, cinblock, coublock;
509#ifdef CONFIG_TASK_XACCT
510 u64 rchar, wchar, syscr, syscw;
511#endif
512 struct task_io_accounting ioac;
509 513
510 /* 514 /*
511 * Cumulative ns of scheduled CPU time for dead threads in the 515 * Cumulative ns of scheduled CPU time for dead threads in the