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authorEric Dumazet <edumazet@google.com>2017-01-25 02:18:07 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-25 03:26:14 +0300
commit3ba4bceef23206349d4130ddf140819b365de7c8 (patch)
tree4189bc94f2e769788c9f9859e7a463cf2a27ad0c /fs/proc
parent424f6c4818bbf1b8ccf58aa012ecc19c0bb9b446 (diff)
downloadlinux-3ba4bceef23206349d4130ddf140819b365de7c8.tar.xz
proc: add a schedule point in proc_pid_readdir()
We have seen proc_pid_readdir() invocations holding cpu for more than 50 ms. Add a cond_resched() to be gentle with other tasks. [akpm@linux-foundation.org: coding style fix] Link: http://lkml.kernel.org/r/1484238380.15816.42.camel@edumazet-glaptop3.roam.corp.google.com Signed-off-by: Eric Dumazet <edumazet@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc')
-rw-r--r--fs/proc/base.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 8e7e61b28f31..87c9a9aacda3 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3179,6 +3179,8 @@ int proc_pid_readdir(struct file *file, struct dir_context *ctx)
iter.tgid += 1, iter = next_tgid(ns, iter)) {
char name[PROC_NUMBUF];
int len;
+
+ cond_resched();
if (!has_pid_permissions(ns, iter.task, 2))
continue;