Messages in this thread Patch in this message | | | Date | Wed, 17 Dec 2014 14:30:10 -0800 | From | Andrew Morton <> | Subject | Re: [PATCH 2/2] task_mmu: Add user-space support for resetting mm->hiwater_rss (peak RSS) |
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On Mon, 15 Dec 2014 17:15:33 +0000 Petr Cermak <petrcermak@chromium.org> wrote:
> Peak resident size of a process can be reset by writing "5" to > /proc/pid/clear_refs. The driving use-case for this would be getting the > peak RSS value, which can be retrieved from the VmHWM field in > /proc/pid/status, per benchmark iteration or test scenario.
The term "reset" is ambiguous - it often means "reset it to zero".
This?
--- a/Documentation/filesystems/proc.txt~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss-fix +++ a/Documentation/filesystems/proc.txt @@ -488,7 +488,8 @@ To clear the bits for the file mapped pa To clear the soft-dirty bit > echo 4 > /proc/PID/clear_refs -To reset the peak resident set size ("high water mark") +To reset the peak resident set size ("high water mark") to the process's +current value: > echo 5 > /proc/PID/clear_refs Any other value written to /proc/PID/clear_refs will have no effect. --- a/fs/proc/task_mmu.c~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss-fix +++ a/fs/proc/task_mmu.c @@ -859,7 +859,7 @@ static ssize_t clear_refs_write(struct f if (type == CLEAR_REFS_MM_HIWATER_RSS) { /* * Writing 5 to /proc/pid/clear_refs resets the peak resident - * set size. + * set size to this mm's current rss value. */ down_write(&mm->mmap_sem); reset_mm_hiwater_rss(mm); _
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