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Date:   Tue, 08 Dec 2020 14:02:41 +0000
From:   David Howells <>
To:     Chuck Lever <>,
        Ard Biesheuvel <>
Cc:, Bruce Fields <>,
        CIFS <>,
        Linux NFS Mailing List <>,
        Herbert Xu <>,,,
        Trond Myklebust <>,,,
Subject: Re: Why the auxiliary cipher in gss_krb5_crypto.c?

David Howells <> 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.


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