Re: [PATCH 1/2] cgroup: pids: show number of failed forks since limit reset

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Fri, Jun 24, 2016 at 01:00:48PM +1000, Aleksa Sarai wrote:
This allows users to dynamically adjust their limits based on how many
failed forks happened since they last reset their limits, otherwise they
would have to track (in a racy way) how many limit failures there were
since the last limit change manually. In addition, we log the first
failure since the limit was reset (which was the original semantics of
the patchset).

Isn't that trivially achievable by reading the counter and then
calculating the diff?  I don't think it matters all that much whether
the log message is printed once per cgroup or per config-change.  It's
just a hint for the admin to avoid setting her off on a wild goose
chase.

If a user has a setup where they wait for notifications on changes to pids.event, and then auto-adjust the cgroup limits based on the number of failures you have a race condition between reading the pids.event file and then setting the new limit. Then, upon getting notified again there may have been many failed forks with the old limit set, so you might decide to bump up the limit again.

It's not a huge deal, I just though it could be useful to alleviate problems like the above.

--
Aleksa Sarai
Software Engineer (Containers)
SUSE Linux GmbH
https://www.cyphar.com/
--
To unsubscribe from this list: send the line "unsubscribe linux-doc" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html



[Index of Archives]     [Kernel Newbies]     [Security]     [Netfilter]     [Bugtraq]     [Linux FS]     [Yosemite Forum]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Samba]     [Video 4 Linux]     [Device Mapper]     [Linux Resources]

  Powered by Linux