On Fri, 13 May 2011 01:47:47 -0700
Greg Thelen <gthelen@xxxxxxxxxx> wrote:
> Add writeback_control fields to differentiate between bdi-wide and
> per-cgroup writeback. Cgroup writeback is also able to differentiate
> between writing inodes isolated to a particular cgroup and inodes shared
> by multiple cgroups.
>
> Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>
Personally, I want to see new flags with their usage in a patch...
> ---
> include/linux/writeback.h | 2 ++
> 1 files changed, 2 insertions(+), 0 deletions(-)
>
> diff --git a/include/linux/writeback.h b/include/linux/writeback.h
> index d10d133..4f5c0d2 100644
> --- a/include/linux/writeback.h
> +++ b/include/linux/writeback.h
> @@ -47,6 +47,8 @@ struct writeback_control {
> unsigned for_reclaim:1; /* Invoked from the page allocator */
> unsigned range_cyclic:1; /* range_start is cyclic */
> unsigned more_io:1; /* more io to be dispatched */
> + unsigned for_cgroup:1; /* enable cgroup writeback */
> + unsigned shared_inodes:1; /* write inodes spanning cgroups */
> };
If shared_inode is really rare case...we don't need to have this shared_inodes
flag and do writeback shared_inode always.....No ?
Thanks,
-Kame
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