From mboxrd@z Thu Jan 1 00:00:00 1970 From: Alex Shi Subject: Re: [PATCH v18 00/32] per memcg lru_lock Date: Fri, 28 Aug 2020 13:22:28 +0800 Message-ID: <327a1bb4-b64d-65b8-e18f-db33e03ca9ed@linux.alibaba.com> References: <1598273705-69124-1-git-send-email-alex.shi@linux.alibaba.com> <20200824114204.cc796ca182db95809dd70a47@linux-foundation.org> <20200825015627.3c3pnwauqznnp3gc@ca-dmjordan1.us.oracle.com> <20200826011946.spknwjt44d2szrdo@ca-dmjordan1.us.oracle.com> <01ed6e45-3853-dcba-61cb-b429a49a7572@linux.alibaba.com> <20200828014022.y5xju6weysqpzxd2@ca-dmjordan1.us.oracle.com> Mime-Version: 1.0 Content-Transfer-Encoding: quoted-printable Return-path: In-Reply-To: <20200828014022.y5xju6weysqpzxd2@ca-dmjordan1.us.oracle.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: Content-Type: text/plain; charset="iso-8859-1" To: Daniel Jordan Cc: Hugh Dickins , Andrew Morton , mgorman@techsingularity.net, tj@kernel.org, khlebnikov@yandex-team.ru, willy@infradead.org, hannes@cmpxchg.org, lkp@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, shakeelb@google.com, iamjoonsoo.kim@lge.com, richard.weiyang@gmail.com, kirill@shutemov.name, alexander.duyck@gmail.com, rong.a.chen@intel.com, mhocko@suse.com, vdavydov.dev@gmail.com, shy828301@gmail.com =D4=DA 2020/8/28 =C9=CF=CE=E79:40, Daniel Jordan =D0=B4=B5=C0: > I went back to your v1 post to see what motivated you originally, and you= had > some results from aim9 but nothing about where this reared its head in the > first place. How did you discover the bottleneck? I'm just curious abou= t how > lru_lock hurts in practice. We have gotten very high 'sys' in some buiness/machines. And found much of = time spent on the lru_lock and/or zone lock. Seems per memcg lru_lock could help this,= but still no idea on zone lock. Thanks Alex