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proc: add cond_resched to /proc/kpage* read/write loop

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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>
This commit is contained in:
Vladimir Davydov 2015-09-09 15:35:51 -07:00 committed by Linus Torvalds
parent f074a8f49e
commit d3691d2c6d
1 changed files with 6 additions and 0 deletions
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6
fs/proc/page.c
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@ -58,6 +58,8 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf,
pfn++; pfn++;
out++; out++;
count -= KPMSIZE; count -= KPMSIZE;
cond_resched();
} }
*ppos += (char __user *)out - buf; *ppos += (char __user *)out - buf;
@ -219,6 +221,8 @@ static ssize_t kpageflags_read(struct file *file, char __user *buf,
pfn++; pfn++;
out++; out++;
count -= KPMSIZE; count -= KPMSIZE;
cond_resched();
} }
*ppos += (char __user *)out - buf; *ppos += (char __user *)out - buf;
@ -267,6 +271,8 @@ static ssize_t kpagecgroup_read(struct file *file, char __user *buf,
pfn++; pfn++;
out++; out++;
count -= KPMSIZE; count -= KPMSIZE;
cond_resched();
} }
*ppos += (char __user *)out - buf; *ppos += (char __user *)out - buf;