lkml.org 
[lkml]   [2009]   [Aug]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH 19/23] io-controller: map async requests to appropriate cgroup
Vivek Goyal wrote:
> o So far we were assuming that a bio/rq belongs to the task who is submitting
> it. It did not hold good in case of async writes. This patch makes use of
> blkio_cgroup pataches to attribute the aysnc writes to right group instead
> of task submitting the bio.
>
> o For sync requests, we continue to assume that io belongs to the task
> submitting it. Only in case of async requests, we make use of io tracking
> patches to track the owner cgroup.
>
> o So far cfq always caches the async queue pointer. With async requests now
> not necessarily being tied to submitting task io context, caching the
> pointer will not help for async queues. This patch introduces a new config
> option CONFIG_TRACK_ASYNC_CONTEXT. If this option is not set, cfq retains
> old behavior where async queue pointer is cached in task context. If it
> is set, async queue pointer is not cached and we take help of bio
> tracking patches to determine group bio belongs to and then map it to
> async queue of that group.
>
> Signed-off-by: Nauman Rafique <nauman@google.com>
> Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
> Signed-off-by: Vivek Goyal <vgoyal@redhat.com>

Acked-by: Rik van Riel <riel@redhat.com>



\
 
 \ /
  Last update: 2009-08-31 19:43    [from the cache]
©2003-2011 Jasper Spaans