linux-kernel - Re: [PATCH 3/5] cifsd: add file operations

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Message-ID: <YFhdWeedjQQgJdbi@google.com>
Date:   Mon, 22 Mar 2021 18:03:21 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Namjae Jeon <namjae.jeon@...sung.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-cifs@...r.kernel.org,
        linux-cifsd-devel@...ts.sourceforge.net, smfrench@...il.com,
        senozhatsky@...omium.org, hyc.lee@...il.com,
        viro@...iv.linux.org.uk, hch@....de, hch@...radead.org,
        ronniesahlberg@...il.com, aurelien.aptel@...il.com,
        aaptel@...e.com, sandeen@...deen.net, dan.carpenter@...cle.com,
        colin.king@...onical.com, rdunlap@...radead.org,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        Steve French <stfrench@...rosoft.com>
Subject: Re: [PATCH 3/5] cifsd: add file operations

On (21/03/22 08:15), Matthew Wilcox wrote:
> 
> What's the scenario for which your allocator performs better than slub
> 

IIRC request and reply buffers can be up to 4M in size. So this stuff
just allocates a number of fat buffers and keeps them around so that
it doesn't have to vmalloc(4M) for every request and every response.