linux-kernel - Re: [RFC PATCH] fs: block_dev: compute nr_vecs hint for improving writeback bvecs allocation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210105183938.GA3878@lst.de>
Date:   Tue, 5 Jan 2021 19:39:38 +0100
From:   Christoph Hellwig <hch@....de>
To:     Ming Lei <ming.lei@...hat.com>
Cc:     Jens Axboe <axboe@...nel.dk>, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: [RFC PATCH] fs: block_dev: compute nr_vecs hint for improving
 writeback bvecs allocation

At least for iomap I think this is the wrong approach.  Between the
iomap and writeback_control we know the maximum size of the writeback
request and can just use that.  Take a look at what iomap_readpage_actor
does on the read size, something similar taking the wbc into account
can be done on the writeback side.