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| author | Vladimir Davydov <vdavydov@parallels.com> | 2015-09-10 00:35:51 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-10 22:29:01 +0200 |
| commit | d3691d2c6d3e72624c987bbef6f322631bbb2d5d (patch) | |
| tree | f87defd1e939131c6c46ab826ec0f901f59cbc95 | |
| parent | proc: export idle flag via kpageflags (diff) | |
| download | linux-d3691d2c6d3e72624c987bbef6f322631bbb2d5d.tar.xz linux-d3691d2c6d3e72624c987bbef6f322631bbb2d5d.zip | |
proc: add cond_resched to /proc/kpage* read/write loop
Reading/writing a /proc/kpage* file may take long on machines with a lot
of RAM installed.
Signed-off-by: Vladimir Davydov <vdavydov@parallels.com>
Suggested-by: Andres Lagar-Cavilla <andreslc@google.com>
Reviewed-by: Andres Lagar-Cavilla <andreslc@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
Cc: Greg Thelen <gthelen@google.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/page.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/proc/page.c b/fs/proc/page.c index 0b8286450a93..93484034a03d 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -58,6 +58,8 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf, pfn++; out++; count -= KPMSIZE; + + cond_resched(); } *ppos += (char __user *)out - buf; @@ -219,6 +221,8 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf, pfn++; out++; count -= KPMSIZE; + + cond_resched(); } *ppos += (char __user *)out - buf; @@ -267,6 +271,8 @@ static ssize_t kpagecgroup_read(struct file *file, char __user *buf, pfn++; out++; count -= KPMSIZE; + + cond_resched(); } *ppos += (char __user *)out - buf; |