linux-kernel - Re: [PATCH 02/12] mm: allow read-ahead with IOCB

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Date:   Tue, 26 May 2020 16:45:52 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     io-uring@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        akpm@...ux-foundation.org
Subject: Re: [PATCH 02/12] mm: allow read-ahead with IOCB_NOWAIT set

On Tue, May 26, 2020 at 01:51:13PM -0600, Jens Axboe wrote:
> The read-ahead shouldn't block, so allow it to be done even if
> IOCB_NOWAIT is set in the kiocb.
> 
> Signed-off-by: Jens Axboe <axboe@...nel.dk>

Acked-by: Johannes Weiner <hannes@...xchg.org>

Looks reasonable. Especially after patch 1 - although it seems that
even before that, IOCB_NOWAIT could have occasionally ended up in
page_cache_async_readahead(), which isn't too different from the sync
variant except for the range calculations, and may have blocked on IO
submission in the past.