linux-kernel - Re: Why the auxiliary cipher in gss_krb5

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Message-ID: <959900.1607436161@warthog.procyon.org.uk>
Date:   Tue, 08 Dec 2020 14:02:41 +0000
From:   David Howells <dhowells@...hat.com>
To:     Chuck Lever <chuck.lever@...cle.com>,
        Ard Biesheuvel <ardb@...nel.org>
Cc:     dhowells@...hat.com, Bruce Fields <bfields@...ldses.org>,
        CIFS <linux-cifs@...r.kernel.org>,
        Linux NFS Mailing List <linux-nfs@...r.kernel.org>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        linux-crypto@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-afs@...ts.infradead.org
Subject: Re: Why the auxiliary cipher in gss_krb5_crypto.c?

David Howells <dhowells@...hat.com> wrote:

> I wonder - would it make sense to reserve two arrays of scatterlist structs
> and a mutex per CPU sufficient to map up to 1MiB of pages with each array
> while the krb5 service is in use?

Actually, simply reserving a set per CPU is probably unnecessary.  We could,
say, set a minimum and a maximum on the reservations (say 2 -> 2*nr_cpus) and
then allocate new ones when we run out.  Then let the memory shrinker clean
them up off an lru list.

David