linux-kernel - Re: [PATCH V5 04/17] blk-throttle: configure bps/iops limit for cgroup in low limit

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 9 Jan 2017 12:35:18 -0500
From:   Tejun Heo <tj@...nel.org>
To:     Shaohua Li <shli@...com>
Cc:     linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, axboe@...com, vgoyal@...hat.com
Subject: Re: [PATCH V5 04/17] blk-throttle: configure bps/iops limit for
 cgroup in low limit

Hello,

On Thu, Dec 15, 2016 at 12:32:55PM -0800, Shaohua Li wrote:
> each queue will have a state machine. Initially queue is in LIMIT_LOW
> state, which means all cgroups will be throttled according to their low
> limit. After all cgroups with low limit cross the limit, the queue state
> gets upgraded to LIMIT_MAX state.

As with the previous patch, I don't think it's correct to default to
MAX for LIMIT_LOW and then enforce it.  Without specific
configuration, a cgroup should always be above below (so, no latency
requirement) and below max (no hard limiting).

Thanks.

-- 
tejun