linux-kernel - Re: [PATCH 05/11] afs: Fix to take ref on page when PG

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Message-ID: <442540.1603898676@warthog.procyon.org.uk>
Date:   Wed, 28 Oct 2020 15:24:36 +0000
From:   David Howells <dhowells@...hat.com>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     dhowells@...hat.com, linux-afs@...ts.infradead.org,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 05/11] afs: Fix to take ref on page when PG_private is set

Matthew Wilcox <willy@...radead.org> wrote:

> There's an efficiency question here that I can't answer ... how often do
> you call afs_write_begin() on a page which already has PagePrivate set?

That's a question only userspace can answer - but think shell scripts that do
lots of small appends.

David