lkml.org 
[lkml]   [2013]   [Jan]   [9]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v2] fadvise: perform WILLNEED readahead asynchronously
Simon Jeons <simon.jeons@gmail.com> wrote:
> On Tue, 2012-12-25 at 02:22 +0000, Eric Wong wrote:
>
> Please add changelog.

Changes since v1:

* separate unbound workqueue for high-priority tasks

* account for inflight readahead to avoid denial-of-service

* limit concurrency for non-high-priority tasks (1 per CPU, same as aio)

* take IO priority of requesting process into account when in workqueue.

* process queued readahead in 2M chunks to help ensure fairness between
multiple requests with few CPUs/workqueues. Idle tasks get smaller
256K chunks.

* stops readahead for idle tasks on read congestion

Will try to benchmark with Postgres when I get the chance.

Any other (Free Software) applications that might benefit from
lower FADV_WILLNEED latency?


\
 
 \ /
  Last update: 2013-01-10 05:41    [W:0.100 / U:0.296 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site