From 6eaeeaba39e5fa3d52a0bb8de15e995516ae251a Mon Sep 17 00:00:00 2001 From: Eric Dumazet Date: Thu, 10 May 2007 22:22:37 -0700 Subject: [PATCH] getrusage(): fill ru_inblock and ru_oublock fields if possible MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Cc: Oleg Nesterov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/sched.h | 1 + include/linux/task_io_accounting_ops.h | 28 ++++++++++++++++++++++++++ kernel/exit.c | 9 +++++++++ kernel/fork.c | 1 + kernel/sys.c | 7 +++++++ 5 files changed, 46 insertions(+) diff --git a/include/linux/sched.h b/include/linux/sched.h index 17b72d88c4..75f44379b7 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -469,6 +469,7 @@ struct signal_struct { cputime_t utime, stime, cutime, cstime; unsigned long nvcsw, nivcsw, cnvcsw, cnivcsw; unsigned long min_flt, maj_flt, cmin_flt, cmaj_flt; + unsigned long inblock, oublock, cinblock, coublock; /* * Cumulative ns of scheduled CPU time for dead threads in the diff --git a/include/linux/task_io_accounting_ops.h b/include/linux/task_io_accounting_ops.h index df2a319106..1218733ec6 100644 --- a/include/linux/task_io_accounting_ops.h +++ b/include/linux/task_io_accounting_ops.h @@ -10,11 +10,29 @@ static inline void task_io_account_read(size_t bytes) current->ioac.read_bytes += bytes; } +/* + * We approximate number of blocks, because we account bytes only. + * A 'block' is 512 bytes + */ +static inline unsigned long task_io_get_inblock(const struct task_struct *p) +{ + return p->ioac.read_bytes >> 9; +} + static inline void task_io_account_write(size_t bytes) { current->ioac.write_bytes += bytes; } +/* + * We approximate number of blocks, because we account bytes only. + * A 'block' is 512 bytes + */ +static inline unsigned long task_io_get_oublock(const struct task_struct *p) +{ + return p->ioac.write_bytes >> 9; +} + static inline void task_io_account_cancelled_write(size_t bytes) { current->ioac.cancelled_write_bytes += bytes; @@ -31,10 +49,20 @@ static inline void task_io_account_read(size_t bytes) { } +static inline unsigned long task_io_get_inblock(const struct task_struct *p) +{ + return 0; +} + static inline void task_io_account_write(size_t bytes) { } +static inline unsigned long task_io_get_oublock(const struct task_struct *p) +{ + return 0; +} + static inline void task_io_account_cancelled_write(size_t bytes) { } diff --git a/kernel/exit.c b/kernel/exit.c index b0c6f0c3a2..7a5fd77f8f 100644 --- a/kernel/exit.c +++ b/kernel/exit.c @@ -42,6 +42,7 @@ #include /* for audit_free() */ #include #include +#include #include #include @@ -113,6 +114,8 @@ static void __exit_signal(struct task_struct *tsk) sig->nvcsw += tsk->nvcsw; sig->nivcsw += tsk->nivcsw; sig->sched_time += tsk->sched_time; + sig->inblock += task_io_get_inblock(tsk); + sig->oublock += task_io_get_oublock(tsk); sig = NULL; /* Marker for below. */ } @@ -1193,6 +1196,12 @@ static int wait_task_zombie(struct task_struct *p, int noreap, p->nvcsw + sig->nvcsw + sig->cnvcsw; psig->cnivcsw += p->nivcsw + sig->nivcsw + sig->cnivcsw; + psig->cinblock += + task_io_get_inblock(p) + + sig->inblock + sig->cinblock; + psig->coublock += + task_io_get_oublock(p) + + sig->oublock + sig->coublock; spin_unlock_irq(&p->parent->sighand->siglock); } diff --git a/kernel/fork.c b/kernel/fork.c index 5dd3979747..da92e01aba 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]); diff --git a/kernel/sys.c b/kernel/sys.c index cdb7e9457b..ec319bbb0b 100644 --- a/kernel/sys.c +++ b/kernel/sys.c @@ -29,6 +29,7 @@ #include #include #include +#include #include #include @@ -2082,6 +2083,8 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) r->ru_nivcsw = p->signal->cnivcsw; r->ru_minflt = p->signal->cmin_flt; r->ru_majflt = p->signal->cmaj_flt; + r->ru_inblock = p->signal->cinblock; + r->ru_oublock = p->signal->coublock; if (who == RUSAGE_CHILDREN) break; @@ -2093,6 +2096,8 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) r->ru_nivcsw += p->signal->nivcsw; r->ru_minflt += p->signal->min_flt; r->ru_majflt += p->signal->maj_flt; + r->ru_inblock += p->signal->inblock; + r->ru_oublock += p->signal->oublock; t = p; do { utime = cputime_add(utime, t->utime); @@ -2101,6 +2106,8 @@ static void k_getrusage(struct task_struct *p, int who, struct rusage *r) r->ru_nivcsw += t->nivcsw; r->ru_minflt += t->min_flt; r->ru_majflt += t->maj_flt; + r->ru_inblock += task_io_get_inblock(t); + r->ru_oublock += task_io_get_oublock(t); t = next_thread(t); } while (t != p); break; -- 2.39.5