The patch titled
Subject: fs/proc/task_mmu.c: add user-space support for resetting mm->hiwater_rss (peak RSS)
has been added to the -mm tree. Its filename is
task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss.patch
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From: Petr Cermak <petrcermak@xxxxxxxxxxxx>
Subject: fs/proc/task_mmu.c: add user-space support for resetting mm->hiwater_rss (peak RSS)
Peak resident size of a process can be reset back to the process's current
rss value 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.
Signed-off-by: Petr Cermak <petrcermak@xxxxxxxxxxxx>
Cc: Bjorn Helgaas <bhelgaas@xxxxxxxxxx>
Cc: Primiano Tucci <primiano@xxxxxxxxxxxx>
Cc: Petr Cermak <petrcermak@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/filesystems/proc.txt | 3 +++
fs/proc/task_mmu.c | 15 ++++++++++++++-
include/linux/mm.h | 5 +++++
3 files changed, 22 insertions(+), 1 deletion(-)
diff -puN Documentation/filesystems/proc.txt~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss Documentation/filesystems/proc.txt
--- a/Documentation/filesystems/proc.txt~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss
+++ a/Documentation/filesystems/proc.txt
@@ -488,6 +488,9 @@ 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")
+ > echo 5 > /proc/PID/clear_refs
+
Any other value written to /proc/PID/clear_refs will have no effect.
The /proc/pid/pagemap gives the PFN, which can be used to find the pageflags
diff -puN fs/proc/task_mmu.c~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss fs/proc/task_mmu.c
--- a/fs/proc/task_mmu.c~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss
+++ a/fs/proc/task_mmu.c
@@ -747,6 +747,7 @@ enum clear_refs_types {
CLEAR_REFS_ANON,
CLEAR_REFS_MAPPED,
CLEAR_REFS_SOFT_DIRTY,
+ CLEAR_REFS_MM_HIWATER_RSS,
CLEAR_REFS_LAST,
};
@@ -855,6 +856,17 @@ static ssize_t clear_refs_write(struct f
if (!mm)
goto out_task;
+ if (type == CLEAR_REFS_MM_HIWATER_RSS) {
+ /*
+ * Writing 5 to /proc/pid/clear_refs resets the peak resident
+ * set size.
+ */
+ down_write(&mm->mmap_sem);
+ reset_mm_hiwater_rss(mm);
+ up_write(&mm->mmap_sem);
+ goto out_mm;
+ }
+
struct clear_refs_private cp = {
.type = type,
};
@@ -904,8 +916,9 @@ static ssize_t clear_refs_write(struct f
mmu_notifier_invalidate_range_end(mm, 0, -1);
flush_tlb_mm(mm);
up_read(&mm->mmap_sem);
- mmput(mm);
+out_mm:
+ mmput(mm);
out_task:
put_task_struct(task);
diff -puN include/linux/mm.h~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss include/linux/mm.h
--- a/include/linux/mm.h~task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss
+++ a/include/linux/mm.h
@@ -1368,6 +1368,11 @@ static inline void update_hiwater_vm(str
mm->hiwater_vm = mm->total_vm;
}
+static inline void reset_mm_hiwater_rss(struct mm_struct *mm)
+{
+ mm->hiwater_rss = get_mm_rss(mm);
+}
+
static inline void setmax_mm_hiwater_rss(unsigned long *maxrss,
struct mm_struct *mm)
{
_
Patches currently in -mm which might be from petrcermak@xxxxxxxxxxxx are
task_mmu-reduce-excessive-indentation-in-clear_refs_write.patch
task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss.patch
task_mmu-add-user-space-support-for-resetting-mm-hiwater_rss-peak-rss-fix.patch
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