linux-kernel - Re: [PATCHSET v5 0/12] Add support for async buffered reads

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Message-ID: <20200605225429.s424lrrqhaseoa2h@alap3.anarazel.de>
Date:   Fri, 5 Jun 2020 15:54:29 -0700
From:   Andres Freund <andres@...razel.de>
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: [PATCHSET v5 0/12] Add support for async buffered reads

Hi,

On 2020-06-05 16:49:24 -0600, Jens Axboe wrote:
> Yes that's expected, if we have to fallback to ->readpage(), then it'll
> go to a worker. read-ahead is what drives the async nature of it, as we
> issue the range (plus more, depending on RA window) as read-ahead for
> the normal read, then wait for it.

But I assume async would still work for files with POSIX_FADV_RANDOM
set, or not? Assuming the system wide setting isn't zero, of course.

Greetings,

Andres Freund