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Re: [PATCH] xen/blkfront: speed up purge_persistent_grants()
- To: Juergen Gross <jgross@xxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Fri, 11 Mar 2022 12:01:40 +0100
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- Cc: <xen-devel@xxxxxxxxxxxxxxxxxxxx>, <linux-block@xxxxxxxxxxxxxxx>, <linux-kernel@xxxxxxxxxxxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Jens Axboe <axboe@xxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>
- Delivery-date: Fri, 11 Mar 2022 11:01:58 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On Fri, Mar 11, 2022 at 11:35:27AM +0100, 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: Roger Pau Monné <roger.pau@xxxxxxxxxx>
Thanks.
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