The patch titled
Subject: delayacct: fix incomplete disable operation when switch enable to disable
has been added to the -mm tree. Its filename is
delayacct-fix-incomplete-disable-operation-when-switch-enable-to-disable.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/delayacct-fix-incomplete-disable-operation-when-switch-enable-to-disable.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/delayacct-fix-incomplete-disable-operation-when-switch-enable-to-disable.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Yang Yang <yang.yang29@xxxxxxxxxx>
Subject: delayacct: fix incomplete disable operation when switch enable to disable
When a task is created after delayacct is enabled, kernel will do all the
delay accountings for that task. The problems is if user disables
delayacct by set /proc/sys/kernel/task_delayacct to zero, only blkio delay
accounting is disabled.
Now disable all the kinds of delay accountings when
/proc/sys/kernel/task_delayacct sets to zero.
Link: https://lkml.kernel.org/r/20211123140342.32962-1-ran.xiaokai@xxxxxxxxxx
Signed-off-by: Yang Yang <yang.yang29@xxxxxxxxxx>
Reported-by: Zeal Robot <zealci@xxxxxxxxxx>
Cc: Balbir Singh <bsingharora@xxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/delayacct.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- a/include/linux/delayacct.h~delayacct-fix-incomplete-disable-operation-when-switch-enable-to-disable
+++ a/include/linux/delayacct.h
@@ -131,36 +131,54 @@ static inline __u64 delayacct_blkio_tick
static inline void delayacct_freepages_start(void)
{
+ if (!static_branch_unlikely(&delayacct_key))
+ return;
+
if (current->delays)
__delayacct_freepages_start();
}
static inline void delayacct_freepages_end(void)
{
+ if (!static_branch_unlikely(&delayacct_key))
+ return;
+
if (current->delays)
__delayacct_freepages_end();
}
static inline void delayacct_thrashing_start(void)
{
+ if (!static_branch_unlikely(&delayacct_key))
+ return;
+
if (current->delays)
__delayacct_thrashing_start();
}
static inline void delayacct_thrashing_end(void)
{
+ if (!static_branch_unlikely(&delayacct_key))
+ return;
+
if (current->delays)
__delayacct_thrashing_end();
}
static inline void delayacct_swapin_start(void)
{
+ if (!static_branch_unlikely(&delayacct_key))
+ return;
+
if (current->delays)
__delayacct_swapin_start();
}
static inline void delayacct_swapin_end(void)
{
+ if (!static_branch_unlikely(&delayacct_key))
+ return;
+
if (current->delays)
__delayacct_swapin_end();
}
_
Patches currently in -mm which might be from yang.yang29@xxxxxxxxxx are
delayacct-support-swapin-delay-accounting-for-swapping-without-blkio.patch
delayacct-fix-incomplete-disable-operation-when-switch-enable-to-disable.patch
