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Re: [PATCH] xen/blkfront: speed up purge_persistent_grants()
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Fri, 11 Mar 2022 11:50:40 +0100
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- Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, linux-block@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Fri, 11 Mar 2022 10:50:50 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 11.03.2022 11:35, Juergen Gross wrote:
> purge_persistent_grants() is scanning the grants list for persistent
> grants being no longer in use by the backend. When having found such a
> grant, it will be set to "invalid" and pushed to the tail of the list.
>
> Instead of pushing it directly to the end of the list, add it first to
> a temporary list, avoiding to scan those entries again in the main
> list traversal. After having finished the scan, append the temporary
> list to the grant list.
>
> Suggested-by: Jan Beulich <jbeulich@xxxxxxxx>
> Signed-off-by: Juergen Gross <jgross@xxxxxxxx>
Reviewed-by: Jan Beulich <jbeulich@xxxxxxxx>
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