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| author |   Eric Dumazet <dada1@cosmosbay.com> | 2007-05-10 22:22:37 -0700 |
|---|---|---|
| committer |   Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-05-11 08:29:34 -0700 |
| commit | 6eaeeaba39e5fa3d52a0bb8de15e995516ae251a (patch) | |
| tree | 5b4052fabfe107ad5332cb758ad8d86ea5a87848 /kernel/fork.c | |
| parent | uml: shrink kernel stacks (diff) | |
| download | linux-dev-6eaeeaba39e5fa3d52a0bb8de15e995516ae251a.tar.xz linux-dev-6eaeeaba39e5fa3d52a0bb8de15e995516ae251a.zip | |
getrusage(): fill ru_inblock and ru_oublock fields if possible
If CONFIG_TASK_IO_ACCOUNTING is defined, we update io accounting counters for
each task.
This patch permits reporting of values using the well known getrusage()
syscall, filling ru_inblock and ru_oublock instead of null values.
As TASK_IO_ACCOUNTING currently counts bytes counts, we approximate blocks
count doing : nr_blocks = nr_bytes / 512
Example of use :
----------------------
After patch is applied, /usr/bin/time command can now give a good
approximation of IO that the process had to do.
$ /usr/bin/time grep tototo /usr/include/*
Command exited with non-zero status 1
0.00user 0.02system 0:02.11elapsed 1%CPU (0avgtext+0avgdata 0maxresident)k
24288inputs+0outputs (0major+259minor)pagefaults 0swaps
$ /usr/bin/time dd if=/dev/zero of=/tmp/testfile count=1000
1000+0 enregistrements lus
1000+0 enregistrements écrits
512000 octets (512 kB) copiés, 0,00326601 seconde, 157 MB/s
0.00user 0.00system 0:00.00elapsed 80%CPU (0avgtext+0avgdata 0maxresident)k
0inputs+3000outputs (0major+299minor)pagefaults 0swaps
Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Cc: 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 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/kernel/fork.c b/kernel/fork.c index 5dd3979747f5..da92e01aba6b 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -875,6 +875,7 @@ static inline int copy_signal(unsigned long clone_flags, struct task_struct * ts sig->utime = sig->stime = sig->cutime = sig->cstime = cputime_zero; sig->nvcsw = sig->nivcsw = sig->cnvcsw = sig->cnivcsw = 0; sig->min_flt = sig->maj_flt = sig->cmin_flt = sig->cmaj_flt = 0; + sig->inblock = sig->oublock = sig->cinblock = sig->coublock = 0; sig->sched_time = 0; INIT_LIST_HEAD(&sig->cpu_timers[0]); INIT_LIST_HEAD(&sig->cpu_timers[1]); |