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| author | Eric Dumazet <edumazet@google.com> | 2015-12-03 11:12:07 -0800 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2016-01-09 02:56:10 -0500 |
| commit | 3cc4a84e026e8d61b7ffe4a7367ed09a555f2c5b (patch) | |
| tree | d538f2cde041d28d7ca3320d0e88d592cb76abad /fs/9p/cache.c | |
| parent | bc51b2a9193f917f2065313d9971d7d5e867bc81 (diff) | |
| download | lwn-3cc4a84e026e8d61b7ffe4a7367ed09a555f2c5b.tar.gz lwn-3cc4a84e026e8d61b7ffe4a7367ed09a555f2c5b.zip | |
proc: add a reschedule point in proc_readfd_common()
User can pass an arbitrary large buffer to getdents().
It is typically a 32KB buffer used by libc scandir() implementation.
When scanning /proc/{pid}/fd, we can hold cpu way too long,
so add a cond_resched() to be kind with other tasks.
We've seen latencies of more than 50ms on real workloads.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/9p/cache.c')
0 files changed, 0 insertions, 0 deletions