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[35.238.199.243]) by smtp.gmail.com with ESMTPSA id y19sm63666ili.51.2021.04.21.11.24.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 21 Apr 2021 11:24:59 -0700 (PDT) Date: Wed, 21 Apr 2021 18:24:58 +0000 From: Dennis Zhou To: Tejun Heo , Christoph Lameter , Roman Gushchin Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 0/4] percpu: partial chunk depopulation Message-ID: References: <20210419225047.3415425-1-dennis@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210419225047.3415425-1-dennis@kernel.org> X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: D425C6000121 X-Stat-Signature: c673bb8p3ujxfmza89t5su5isy5x5jtf Received-SPF: none (gmail.com>: No applicable sender policy available) receiver=imf25; identity=mailfrom; envelope-from=""; helo=mail-io1-f46.google.com; client-ip=209.85.166.46 X-HE-DKIM-Result: none/none X-HE-Tag: 1619029497-209351 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000002, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Mon, Apr 19, 2021 at 10:50:43PM +0000, Dennis Zhou wrote: > Hello, > > This series is a continuation of Roman's series in [1]. It aims to solve > chunks holding onto free pages by adding a reclaim process to the percpu > balance work item. > > The main difference is that the nr_empty_pop_pages is now managed at > time of isolation instead of intermixed. This helps with deciding which > chunks to free instead of having to interleave returning chunks to > active duty. > > The allocation priority is as follows: > 1) appropriate chunk slot increasing until fit > 2) sidelined chunks > 3) full free chunks > > The last slot for to_depopulate is never used for allocations. > > A big thanks to Roman for initiating the work and being available for > iterating on these ideas. > > This patchset contains the following 4 patches: > 0001-percpu-factor-out-pcpu_check_block_hint.patch > 0002-percpu-use-pcpu_free_slot-instead-of-pcpu_nr_slots-1.patch > 0003-percpu-implement-partial-chunk-depopulation.patch > 0004-percpu-use-reclaim-threshold-instead-of-running-for-.patch > > 0001 and 0002 are clean ups. 0003 implement partial chunk depopulation > initially from Roman. 0004 adds a reclaim threshold so we do not need to > schedule for every page freed. > > This series is on top of percpu$for-5.14 67c2669d69fb. > > diffstats below: > > Dennis Zhou (2): > percpu: use pcpu_free_slot instead of pcpu_nr_slots - 1 > percpu: use reclaim threshold instead of running for every page > > Roman Gushchin (2): > percpu: factor out pcpu_check_block_hint() > percpu: implement partial chunk depopulation > > mm/percpu-internal.h | 5 + > mm/percpu-km.c | 5 + > mm/percpu-stats.c | 20 ++-- > mm/percpu-vm.c | 30 ++++++ > mm/percpu.c | 252 ++++++++++++++++++++++++++++++++++++++----- > 5 files changed, 278 insertions(+), 34 deletions(-) > > Thanks, > Dennis I've applied this to for-5.14 with 1 modification to the batching threshold, 4 pages is quite little, so make it 16. Thanks, Dennis