lkml.org 
[lkml]   [2007]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: O_DIRECT question
Mark Lord wrote:
> You guys need to backup in this thread.
>
> Every example of O_DIRECT here could be replaced with
> calls to mmap(), msync(), and madvise() (or posix_fadvise).
>
> In addition to being at least as fast as O_DIRECT,
> these have the added benefit of using the page cache (avoiding reads for
> data already present, handling multiple
> users of the same data, etc..).

Please actually _read_ the thread. In every one of my posts I have
shown why this is not the case.

To briefly rehash the core of the argument, there is no way to
asynchronously manage IO with mmap, msync, madvise -- instead you take
page faults or otherwise block, thus stalling the pipeline.

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-01-26 18:25    [W:0.176 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site