Re: [PATCH] sbitmap: don't update the allocation hint on clear after resize

[Jens Axboe]

On 09/17/2016 01:20 PM, Omar Sandoval wrote:
> From: Omar Sandoval <osandov@xxxxxx>
>
> If we have a bunch of high-numbered bits allocated and then we resize
> the struct sbitmap_queue, when those bits get cleared, we'll update the
> hint and then have to re-randomize it repeatedly. Avoid that by checking
> that the cleared bit is still a valid hint. No measurable performance
> difference in the common case.
>
> Signed-off-by: Omar Sandoval <osandov@xxxxxx>
> ---
> Jens,
>
> Small tweak to patch 6 that occurred to me after I sent the series out.
> Feel free to fold it in to patch 6 or apply it separately as you see
> fit.

No worries. I can't fold since the series was already applied, so I just
added the extra patch.

--
Jens Axboe