lkml.org 
[lkml]   [2012]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [RFC PATCH v2 15/21] loop: use aio to perform io on the underlying file
Date
Dave Kleikamp <dave.kleikamp@oracle.com> writes:

> On 04/20/2012 09:48 AM, Maxim V. Patlasov wrote:
>> On 03/30/2012 07:43 PM, Dave Kleikamp wrote:
>>> From: Zach Brown<zab@zabbo.net>
>>>
>>> This uses the new kernel aio interface to process loopback IO by
>>> submitting concurrent direct aio. Previously loop's IO was serialized
>>> by synchronous processing in a thread.
>>>
>>
>> The patch ignores REQ_FLUSH bit of bi_rw. Is it simply overlook?
>
> Good question. Since the loop device is sending only direct IO requests,
> it shouldn't be necessary to explicitly flush page cache, but REQ_FLUSH

REQ_FLUSH isn't about the page cache, it's about flushing the volatile
disk write cache. You need to handle that.

Cheers,
Jeff


\
 
 \ /
  Last update: 2012-04-20 17:23    [W:0.102 / U:0.488 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site