From: Zach Brown <zach.brown@oracle.com>
To: "Raz Ben-Jehuda(caro)" <raziebe@gmail.com>
Cc: linux-aio@kvack.org, Xavier Roche <roche+kml2@exalead.com>,
linux-kernel@vger.kernel.org
Subject: Re: io_submit() taking a long time to return ?
Date: Thu, 13 Jul 2006 09:48:33 -0700 [thread overview]
Message-ID: <44B67961.4040600@oracle.com> (raw)
In-Reply-To: <5d96567b0607130932g7ba6cf0jfebdb0af9c933000@mail.gmail.com>
> what do u means by "sync block mapping " ?
To find out what blocks to issue async IO against the submission path
reads metadata from the file system that maps file regions to disk
blocks. These metadata reads are synchronous and so can block the
submitting task. The mappings tend to be cached, though, which is why
this doesn't seem to be a problem in practice.
- z
prev parent reply other threads:[~2006-07-13 16:49 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-07-13 6:51 io_submit() taking a long time to return ? Xavier Roche
2006-07-13 15:44 ` Zach Brown
2006-07-13 16:32 ` Raz Ben-Jehuda(caro)
2006-07-13 16:48 ` Zach Brown [this message]
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