linux-kernel - Re: [PATCH v2 0/4] huge vmalloc mappings

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Message-Id: <1586866432.g0r7udmtjr.astroid@bobo.none>
Date:   Tue, 14 Apr 2020 22:23:11 +1000
From:   Nicholas Piggin <npiggin@...il.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        "H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, linuxppc-dev@...ts.ozlabs.org,
        Ingo Molnar <mingo@...hat.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will@...nel.org>, x86@...nel.org
Subject: Re: [PATCH v2 0/4] huge vmalloc mappings

Excerpts from David Rientjes's message of April 14, 2020 10:27 am:
> On Mon, 13 Apr 2020, Nicholas Piggin wrote:
> 
>> We can get a significant win with larger mappings for some of the big
>> global hashes.
>> 
>> Since RFC, relevant architectures have added p?d_leaf accessors so no
>> real arch changes required, and I changed it not to allocate huge
>> mappings for modules and a bunch of other fixes.
>> 
> 
> Hi Nicholas,
> 
> Any performance numbers to share besides the git diff in the last patch in 
> the series?  I'm wondering if anything from mmtests or lkp-tests makes 
> sense to try?

Hey, no I don't have any other tests I've run. Some of the networking
hashes do make use of it as well though, and might see a few % in
the right kind of workload. There's probably a bunch of other stuff
where it could help a little bit, looking through the tree, I just don't
have anything specific.

Thanks,
Nick