Re: [PATCH] iomap: allow iomap using the per-cpu bio cache

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To: Fengnan Chang <changfengnan@xxxxxxxxxxxxx>
Subject: Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
From: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date: Mon, 25 Aug 2025 02:21:01 -0700
Cc: Ritesh Harjani <ritesh.list@xxxxxxxxx>, Matthew Wilcox <willy@xxxxxxxxxxxxx>, "Darrick J. Wong" <djwong@xxxxxxxxxx>, brauner@xxxxxxxxxx, linux-xfs@xxxxxxxxxxxxxxx, linux-fsdevel@xxxxxxxxxxxxxxx, Jens Axboe <axboe@xxxxxxxxx>, linux-block@xxxxxxxxxxxxxxx
In-reply-to: <CAPFOzZufTPCT_56-7LCc6oGHYiaPixix30yFNEsiFfN1s9ySMQ@mail.gmail.com>
References: <20250822082606.66375-1-changfengnan@bytedance.com> <20250822150550.GP7942@frogsfrogsfrogs> <aKiP966iRv5gEBwm@casper.infradead.org> <877byv9w6z.fsf@gmail.com> <aKif_644529sRXhN@casper.infradead.org> <874ityad1d.fsf@gmail.com> <CAPFOzZufTPCT_56-7LCc6oGHYiaPixix30yFNEsiFfN1s9ySMQ@mail.gmail.com>

On Mon, Aug 25, 2025 at 04:51:27PM +0800, Fengnan Chang wrote:
> No restrictions for now, I think we can enable this by default.
> Maybe better solution is modify in bio.c?  Let me do some test first.

Any kind of numbers you see where this makes a different, including
the workloads would also be very valuable here.

Follow-Ups:
- Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
  - From: Fengnan Chang

References:
- Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
  - From: Matthew Wilcox
- Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
  - From: IBM
- Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
  - From: Matthew Wilcox
- Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
  - From: IBM
- Re: [PATCH] iomap: allow iomap using the per-cpu bio cache
  - From: Fengnan Chang

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