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[66.187.233.206]) by smtp.gmail.com with ESMTPSA id s43sm14189589qth.47.2019.03.28.08.24.48 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Thu, 28 Mar 2019 08:24:49 -0700 (PDT) Message-ID: <1553786687.26196.26.camel@lca.pw> Subject: Re: [PATCH v4] kmemleak: survive in a low-memory situation From: Qian Cai To: Catalin Marinas , Matthew Wilcox Cc: Michal Hocko , akpm@linux-foundation.org, cl@linux.com, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Date: Thu, 28 Mar 2019 11:24:47 -0400 In-Reply-To: <20190328145917.GC10283@arrakis.emea.arm.com> References: <20190327005948.24263-1-cai@lca.pw> <20190327084432.GA11927@dhcp22.suse.cz> <20190327172955.GB17247@arrakis.emea.arm.com> <20190327182158.GS10344@bombadil.infradead.org> <20190328145917.GC10283@arrakis.emea.arm.com> Content-Type: text/plain; charset="UTF-8" X-Mailer: Evolution 3.22.6 (3.22.6-10.el7) Mime-Version: 1.0 Content-Transfer-Encoding: 7bit X-Bogosity: Ham, tests=bogofilter, spamicity=0.000007, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, 2019-03-28 at 14:59 +0000, Catalin Marinas wrote: 2 > +/* minimum memory pool sizes */ > +#define MIN_OBJECT_POOL (NR_CPUS * 4) > +#define MIN_SCAN_AREA_POOL (NR_CPUS * 1) I am thinking about making those are tunable, so people could have a big pool depends on their workloads. Also, I would like to see a way to refill this emergency pool. For example, once OOM kiler freed up more memory. Maybe at the time of kmemleak_scan kthread kicked in and then monitor and refill the pool whenever possible.