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SubjectRe: [PATCH 18/24] blkio_cgroup patches from Ryo to track async bios.
On Tue, Aug 18, 2009 at 08:42:12PM +0900, Ryo Tsuruta wrote:
> Hi Vivek,
> Vivek Goyal <> wrote:
> > o blkio_cgroup patches from Ryo to track async bios.
> >
> > o Fernando is also working on another IO tracking mechanism. We are not
> > particular about any IO tracking mechanism. This patchset can make use
> > of any mechanism which makes it to upstream. For the time being making
> > use of Ryo's posting.
> The patch attached with your mail is obsolete and it may potentially
> cause a deadlock when lock_page_cgroup() is called under radix_tree->lock.
> The latest blkio-cgroup fixes the above issue and reduces IO tracking
> overhead since lock_page_cgroup() is no longer used. I would recommend
> to update to the latest version.

Hi Ryo,

Thanks. In next posting I will move to latest version of io tracking

> And I have a suggestion, how about moving get_cgroup_from_page() to
> biotrack.c, I think this function would be useful for people who
> want to make use of the IO tracking mechanism.
> Please let me know your opinion.

Makes sense. In next posting, will move get_cgroup_from_page() to biotrack.c.


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