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Peter Anvin" , linux-arch@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, Ingo Molnar , Thomas Gleixner , Will Deacon , x86@kernel.org References: <20200413125303.423864-1-npiggin@gmail.com> In-Reply-To: MIME-Version: 1.0 Message-Id: <1586866432.g0r7udmtjr.astroid@bobo.none> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Excerpts from David Rientjes's message of April 14, 2020 10:27 am: > On Mon, 13 Apr 2020, Nicholas Piggin wrote: >=20 >> We can get a significant win with larger mappings for some of the big >> global hashes. >>=20 >> 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. >>=20 >=20 > Hi Nicholas, >=20 > Any performance numbers to share besides the git diff in the last patch i= n=20 > the series? I'm wondering if anything from mmtests or lkp-tests makes=20 > 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