lkml.org 
[lkml]   [2010]   [Aug]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC][PATCH] Per file dirty limit throttling
On Mon, Aug 16, 2010 at 12:19:50PM +0800, Nikanth Karthikesan wrote:
> When the total dirty pages exceed vm_dirty_ratio, the dirtier is made to do
> the writeback. But this dirtier may not be the one who took the system to this
> state. Instead, if we can track the dirty count per-file, we could throttle
> the dirtier of a file, when the file's dirty pages exceed a certain limit.
> Even though this dirtier may not be the one who dirtied the other pages of
> this file, it is fair to throttle this process, as it uses that file.

Nikanth, there's a more elegant solution in upstream kernel.
See the comment for task_dirty_limit() in commit 1babe1838.

NFS may want to limit per-file dirty pages, to prevent long stall time
inside the nfs_getattr()->filemap_write_and_wait() calls (and problems
like that). Peter Staubach has similar ideas on it.

Thanks,
Fengguang


\
 
 \ /
  Last update: 2010-08-17 04:43    [W:0.178 / U:0.060 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site