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BACKPORT: timers: implement usleep_idle_range()

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Patch series "mm/damon: Fix fake /proc/loadavg reports", v3.

This patchset fixes DAMON's fake load report issue.  The first patch
makes yet another variant of usleep_range() for this fix, and the second
patch fixes the issue of DAMON by making it using the newly introduced
function.

This patch (of 2):

Some kernel threads such as DAMON could need to repeatedly sleep in
micro seconds level.  Because usleep_range() sleeps in uninterruptible
state, however, such threads would make /proc/loadavg reports fake load.

To help such cases, this commit implements a variant of usleep_range()
called usleep_idle_range().  It is same to usleep_range() but sets the
state of the current task as TASK_IDLE while sleeping.

Link: https://lkml.kernel.org/r/20211126145015.15862-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20211126145015.15862-2-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Cc: John Stultz <john.stultz@linaro.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

(cherry picked from commit e4779015fd5d2fb8390c258268addff24d6077c7)

Bug: 228223814
Signed-off-by: Hailong Tu <tuhailong@oppo.com>
Change-Id: Ie590ba5fcff22c981d0a7ecae6d8e551160136f3
This commit is contained in:
SeongJae Park
2021-12-10 14:46:22 -08:00
committed by Hailong Tu
parent 2581464867
commit a9ec7ed936
2 changed files with 35 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

8
include/linux/delay.h
View File

@@ -20,6 +20,7 @@
*/
#include <linux/kernel.h>
#include <linux/sched.h>
extern unsigned long loops_per_jiffy;
@@ -58,8 +59,15 @@ void calibrate_delay(void);
void __attribute__((weak)) calibration_delay_done(void);
void msleep(unsigned int msecs);
unsigned long msleep_interruptible(unsigned int msecs);
void usleep_range_state(unsigned long min, unsigned long max,
unsigned int state);
void usleep_range(unsigned long min, unsigned long max);
static inline void usleep_idle_range(unsigned long min, unsigned long max)
{
usleep_range_state(min, max, TASK_IDLE);
}
static inline void ssleep(unsigned int seconds)
{
msleep(seconds * 1000);