From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f199.google.com (mail-pf0-f199.google.com [209.85.192.199]) by kanga.kvack.org (Postfix) with ESMTP id B32EB6B0038 for ; Tue, 18 Oct 2016 07:51:23 -0400 (EDT) Received: by mail-pf0-f199.google.com with SMTP id t25so223573621pfg.3 for ; Tue, 18 Oct 2016 04:51:23 -0700 (PDT) Received: from mx0b-0016f401.pphosted.com (mx0a-0016f401.pphosted.com. [67.231.148.174]) by mx.google.com with ESMTPS id r1si3000943paz.327.2016.10.18.04.51.22 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 18 Oct 2016 04:51:23 -0700 (PDT) Date: Tue, 18 Oct 2016 19:21:49 +0800 From: Jisheng Zhang Subject: Re: [RFC] reduce latency in __purge_vmap_area_lazy Message-ID: <20161018192149.3de86109@xhacker> In-Reply-To: <1476773771-11470-1-git-send-email-hch@lst.de> References: <1476773771-11470-1-git-send-email-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Hellwig Cc: akpm@linux-foundation.org, joelaf@google.com, chris@chris-wilson.co.uk, joaodias@google.com, linux-mm@kvack.org, linux-rt-users@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org On Tue, 18 Oct 2016 08:56:05 +0200 Christoph Hellwig wrote: > Hi all, > > this is my spin at sorting out the long lock hold times in > __purge_vmap_area_lazy. It is based on the patch from Joel sent this > week. I don't have any good numbers for it, but it survived an > xfstests run on XFS which is a significant vmalloc user. The > changelogs could still be improved as well, but I'd rather get it > out quickly for feedback and testing. I just tested this series, the preempt off ftrace log doesn't complain __purge_vmap_area_lazy any more in my test case, this latency is removed! So feel free to add Tested-by: Jisheng Zhang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org