Received: by 2002:ac0:a5a6:0:0:0:0:0 with SMTP id m35-v6csp151486imm; Wed, 29 Aug 2018 16:47:35 -0700 (PDT) X-Google-Smtp-Source: ANB0Vda9XfLvRgNqSVm/ibz2beTTDCCtHgiykewHIYYxVkbfz2iXtNlwikbFcA1AoQM7/Vby08AZ X-Received: by 2002:a17:902:5a4e:: with SMTP id f14-v6mr2362068plm.311.1535586454946; Wed, 29 Aug 2018 16:47:34 -0700 (PDT) ARC-Seal: i=1; a=rsa-sha256; t=1535586454; cv=none; d=google.com; s=arc-20160816; b=B9wEwgEJ83OB0Lfxi6jmaZwKBATjoMxYlRRlYQ2jjLbpG0o/Et1V6xb7/p4iBEtDl9 S6dmc4mxiK5hib6/tN18LCkWRfcHqxcfkIThHKu6u5zjWGa/686NBE3FHPLHTRj0+x2y OuNaf8RYm1AV+4tgZ0aRH+FJQIqLHiSx/l0qyRP/UW6Kd4kqcohPPo5weck+MB2B8iU5 qzTMraXhkgAtfLyKanRKGrB4Lrr/pKzyduakAxwzMsbTj6DGj287JH7BpziwB/C93Ab6 o6A4p0jg0CqWjiCngm7Yb9I3p4WafHGQ0qlL8Ry5yRTw9ml9NpaqL+qOjLR2vFGdj1bR RwJw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:sender:content-transfer-encoding:mime-version :references:in-reply-to:message-id:subject:cc:to:from:date :arc-authentication-results; bh=53YKrnVmLM//1P98jM+8At481jzIPCVAVi0r1F/tOow=; b=GndxqiwNmFZkJEKGpklOVEY/uTWH4aNUkRUx7sDPBhavlPhVg+w7Rx51wF5KCL/ZKK ETqv2xlf/sAKzBWXPk8OStQ46l/LvNidQjaikuKhEWpyJP3G/Hupan7CZE4J+4qveEjP jvJM5NNvsbzJ4BjEXk9qf3N7chqt+vGJTE3dEe84h4dJdmTblntRO+z2ttJFW43pvnXI +Yg3tN2dtdsGtIvHvgi4deIqAicb4tfNzFgDoIHOFDa9c+eCDjSNoID0ZpTnDHJyPmIv ov88IMu1hW3OBLpzcQ5nEBFHI2db5nM5g8W8cIiq67rTUaxrbOrrIuISe2gCiXEu+I7a sVTw== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id a4-v6si4756155pff.1.2018.08.29.16.46.51; Wed, 29 Aug 2018 16:47:34 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727493AbeH3Dmu (ORCPT + 99 others); Wed, 29 Aug 2018 23:42:50 -0400 Received: from mail.linuxfoundation.org ([140.211.169.12]:41336 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727434AbeH3Dmu (ORCPT ); Wed, 29 Aug 2018 23:42:50 -0400 Received: from akpm3.svl.corp.google.com (unknown [104.133.8.65]) by mail.linuxfoundation.org (Postfix) with ESMTPSA id 6670E25A; Wed, 29 Aug 2018 23:43:31 +0000 (UTC) Date: Wed, 29 Aug 2018 16:43:30 -0700 From: Andrew Morton To: Alexey Dobriyan Cc: "Ahmed S. Darwish" , linux-kernel@vger.kernel.org Subject: Re: [PATCH 11/13] proc: readdir /proc/*/task Message-Id: <20180829164330.435fb1d1c78e9d066e5eb862@linux-foundation.org> In-Reply-To: <20180828193502.GB4847@avx2> References: <20180827231503.26899-1-adobriyan@gmail.com> <20180827231503.26899-11-adobriyan@gmail.com> <20180828123622.GA2087@darwi-kernel> <20180828130440.GA6464@darwi-kernel> <20180828193502.GB4847@avx2> X-Mailer: Sylpheed 3.6.0 (GTK+ 2.24.31; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 28 Aug 2018 22:35:02 +0300 Alexey Dobriyan wrote: > > Are we really in a super hot path to justify all that? > > /proc is very slow, try profiling just about anything involving /proc. So how much does this patchset help? Some timing measurements would really help things along, if they show goodness.