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[209.132.183.28]) by mx.google.com with ESMTPS id b21si20273811qta.139.2019.07.19.07.07.24 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 19 Jul 2019 07:07:25 -0700 (PDT) Received-SPF: pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) client-ip=209.132.183.28; Authentication-Results: mx.google.com; spf=pass (google.com: domain of longman@redhat.com designates 209.132.183.28 as permitted sender) smtp.mailfrom=longman@redhat.com; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.phx2.redhat.com [10.5.11.11]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 4A0AEC06511B; Fri, 19 Jul 2019 14:07:23 +0000 (UTC) Received: from llong.remote.csb (dhcp-17-160.bos.redhat.com [10.18.17.160]) by smtp.corp.redhat.com (Postfix) with ESMTP id E95B3620BD; Fri, 19 Jul 2019 14:07:20 +0000 (UTC) Subject: Re: [PATCH v2 2/2] mm, slab: Show last shrink time in us when slab/shrink is read To: Michal Hocko Cc: Christoph Lameter , Pekka Enberg , David Rientjes , Joonsoo Kim , Andrew Morton , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Roman Gushchin , Johannes Weiner , Shakeel Butt , Vladimir Davydov References: <20190717202413.13237-1-longman@redhat.com> <20190717202413.13237-3-longman@redhat.com> <20190719061410.GJ30461@dhcp22.suse.cz> From: Waiman Long Organization: Red Hat Message-ID: Date: Fri, 19 Jul 2019 10:07:20 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190719061410.GJ30461@dhcp22.suse.cz> Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.11 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Fri, 19 Jul 2019 14:07:24 +0000 (UTC) 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: On 7/19/19 2:14 AM, Michal Hocko wrote: > On Wed 17-07-19 16:24:13, Waiman Long wrote: >> The show method of /sys/kernel/slab//shrink sysfs file currently >> returns nothing. This is now modified to show the time of the last >> cache shrink operation in us. > Isn't this something that tracing can be used for without any kernel > modifications? That is true, but it will be a bit more cumbersome to get the data. Anyway, this is just a nice to have patch for me. I am perfectly fine with dropping it if this does not prove to be that useful. Thanks, Longman