diff options
| author | Roland McGrath <roland@redhat.com> | 2010-09-07 19:36:28 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2010-10-28 21:51:46 -0700 |
| commit | c7d3b6415c472deae3fab07d06239abba9070c93 (patch) | |
| tree | 8c2d76b115e650c6730aa10c82f8b28a79cca9f6 /fs | |
| parent | a376eaa89e3931a4088deb6ef5d94569688efec0 (diff) | |
execve: improve interactivity with large arguments
commit 7993bc1f4663c0db67bb8f0d98e6678145b387cd upstream.
This adds a preemption point during the copying of the argument and
environment strings for execve, in copy_strings(). There is already
a preemption point in the count() loop, so this doesn't add any new
points in the abstract sense.
When the total argument+environment strings are very large, the time
spent copying them can be much more than a normal user time slice.
So this change improves the interactivity of the rest of the system
when one process is doing an execve with very large arguments.
Signed-off-by: Roland McGrath <roland@redhat.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Chuck Ebbert <cebbert@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/exec.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/exec.c b/fs/exec.c index f1bb0d21d08..e8214175cba 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -420,6 +420,8 @@ static int copy_strings(int argc, char __user * __user * argv, while (len > 0) { int offset, bytes_to_copy; + cond_resched(); + offset = pos % PAGE_SIZE; if (offset == 0) offset = PAGE_SIZE; |