lkml.org 
[lkml]   [2019]   [Feb]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
Subject[PATCH 1/3] sched/wait: use freezable_schedule when possible
Replace schedule(); try_to_freeze() by freezable_schedule().

Tasks calling freezable_schedule() set the PF_FREEZER_SKIP flag
before calling schedule(). Unlike tasks calling schedule();
try_to_freeze() tasks calling freezable_schedule() are not awaken by
try_to_freeze_tasks(). Instead they call try_to_freeze() when they
wake up if the freeze is still underway.

It is not a problem since sleeping tasks can't do anything which isn't
allowed for a frozen task while sleeping.

The result is a potential performance gain during freeze, since less
tasks have to be awaken.

Signed-off-by: Hugo Lefeuvre <hle@owl.eu.com>
---
include/linux/wait.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/include/linux/wait.h b/include/linux/wait.h
index ed7c122cb31f..5f3efabc36f4 100644
--- a/include/linux/wait.h
+++ b/include/linux/wait.h
@@ -308,7 +308,7 @@ do { \

#define __wait_event_freezable(wq_head, condition) \
___wait_event(wq_head, condition, TASK_INTERRUPTIBLE, 0, 0, \
- schedule(); try_to_freeze())
+ freezable_schedule())

/**
* wait_event_freezable - sleep (or freeze) until a condition gets true
@@ -367,7 +367,7 @@ do { \
#define __wait_event_freezable_timeout(wq_head, condition, timeout) \
___wait_event(wq_head, ___wait_cond_timeout(condition), \
TASK_INTERRUPTIBLE, 0, timeout, \
- __ret = schedule_timeout(__ret); try_to_freeze())
+ __ret = freezable_schedule_timeout(__ret))

/*
* like wait_event_timeout() -- except it uses TASK_INTERRUPTIBLE to avoid
@@ -588,7 +588,7 @@ do { \

#define __wait_event_freezable_exclusive(wq, condition) \
___wait_event(wq, condition, TASK_INTERRUPTIBLE, 1, 0, \
- schedule(); try_to_freeze())
+ freezable_schedule())

#define wait_event_freezable_exclusive(wq, condition) \
({ \
--
2.20.1
\
 
 \ /
  Last update: 2019-02-01 06:39    [W:0.095 / U:0.332 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site