* Fwd: /proc/pid/sched units [not found] <CAOVCmzEJqg6=FW3Vu1MScyj8GS-KXb2s_ztxBxwDmcbN5sbQuA@mail.gmail.com> @ 2021-07-28 12:59 ` Shivank Garg 2021-07-30 21:41 ` Michael Kerrisk (man-pages) 0 siblings, 1 reply; 3+ messages in thread From: Shivank Garg @ 2021-07-28 12:59 UTC (permalink / raw) To: linux-doc, linux-man ---------- Forwarded message --------- From: Shivank Garg <shivankgarg98@gmail.com> Date: Wed, Jul 28, 2021 at 6:26 PM Subject: /proc/pid/sched units To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux MM <linux-mm@kvack.org>, <util-linux@vger.kernel.org> Hi Everyone, I'm analyzing the cpu time taken ("se.sum_exec_runtime" in /proc/$pid/sched) by process in different configurations for my project work. But I was not able to get the time units for the values displayed in the file. I tried searching it in source code - kernel/sched/cputime.c,include/linux/sched.h etc. but it left me more confused. Can you please answer me about the measurement units (is it microseconds, nanoseconds, jiffles ...) ? Also, I was not able to find proper documentation for /proc/pid/sched. Please point to me if it's already there. If not, I would love to contribute toward documenting these variables. It would be very helpful for newbies (like me) in future. Thanks, Best Regards, Shivank Garg ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: /proc/pid/sched units 2021-07-28 12:59 ` Fwd: /proc/pid/sched units Shivank Garg @ 2021-07-30 21:41 ` Michael Kerrisk (man-pages) 2021-07-31 3:36 ` Shivank Garg 0 siblings, 1 reply; 3+ messages in thread From: Michael Kerrisk (man-pages) @ 2021-07-30 21:41 UTC (permalink / raw) To: Shivank Garg; +Cc: linux-doc, linux-man Hello Shivank, On Wed, 28 Jul 2021 at 14:59, Shivank Garg <shivankgarg98@gmail.com> wrote: > > ---------- Forwarded message --------- > From: Shivank Garg <shivankgarg98@gmail.com> > Date: Wed, Jul 28, 2021 at 6:26 PM > Subject: /proc/pid/sched units > To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux MM > <linux-mm@kvack.org>, <util-linux@vger.kernel.org> > > > Hi Everyone, > > I'm analyzing the cpu time taken ("se.sum_exec_runtime" in > /proc/$pid/sched) by process in different configurations for my > project work. But I was not able to get the time units for the values > displayed in the file. I tried searching it in source code - > kernel/sched/cputime.c,include/linux/sched.h etc. but it left me more > confused. > > Can you please answer me about the measurement units (is it > microseconds, nanoseconds, jiffles ...) ? > > Also, I was not able to find proper documentation for /proc/pid/sched. > Please point to me if it's already there. If not, I would love to > contribute toward documenting these variables. It would be very > helpful for newbies (like me) in future. It looks like se.sum_exec_runtime is milliseconds. In kernel/sched/debug.c, see proc_sched_show_task(), the definition of the PN() PNS(), and SPLIT_NS() macros, and the nsec_high(x) and nsec_low(x) functions. Thanks, Michael -- Michael Kerrisk Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ Linux/UNIX System Programming Training: http://man7.org/training/ ^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: /proc/pid/sched units 2021-07-30 21:41 ` Michael Kerrisk (man-pages) @ 2021-07-31 3:36 ` Shivank Garg 0 siblings, 0 replies; 3+ messages in thread From: Shivank Garg @ 2021-07-31 3:36 UTC (permalink / raw) To: mtk.manpages; +Cc: linux-doc, linux-man, willy Hi, Thanks for the help. My confusion is clear now. On Sat, Jul 31, 2021 at 3:11 AM Michael Kerrisk (man-pages) <mtk.manpages@gmail.com> wrote: > > Hello Shivank, > > On Wed, 28 Jul 2021 at 14:59, Shivank Garg <shivankgarg98@gmail.com> wrote: > > > > ---------- Forwarded message --------- > > From: Shivank Garg <shivankgarg98@gmail.com> > > Date: Wed, Jul 28, 2021 at 6:26 PM > > Subject: /proc/pid/sched units > > To: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>, Linux MM > > <linux-mm@kvack.org>, <util-linux@vger.kernel.org> > > > > > > Hi Everyone, > > > > I'm analyzing the cpu time taken ("se.sum_exec_runtime" in > > /proc/$pid/sched) by process in different configurations for my > > project work. But I was not able to get the time units for the values > > displayed in the file. I tried searching it in source code - > > kernel/sched/cputime.c,include/linux/sched.h etc. but it left me more > > confused. > > > > Can you please answer me about the measurement units (is it > > microseconds, nanoseconds, jiffles ...) ? > > > > Also, I was not able to find proper documentation for /proc/pid/sched. > > Please point to me if it's already there. If not, I would love to > > contribute toward documenting these variables. It would be very > > helpful for newbies (like me) in future. > > It looks like se.sum_exec_runtime is milliseconds. In > kernel/sched/debug.c, see proc_sched_show_task(), the definition of > the PN() PNS(), and SPLIT_NS() macros, and the nsec_high(x) and > nsec_low(x) functions. > > Thanks, > > Michael > > > -- > Michael Kerrisk > Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/ > Linux/UNIX System Programming Training: http://man7.org/training/ ^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-07-31 3:36 UTC | newest] Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- [not found] <CAOVCmzEJqg6=FW3Vu1MScyj8GS-KXb2s_ztxBxwDmcbN5sbQuA@mail.gmail.com> 2021-07-28 12:59 ` Fwd: /proc/pid/sched units Shivank Garg 2021-07-30 21:41 ` Michael Kerrisk (man-pages) 2021-07-31 3:36 ` Shivank Garg
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