From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-it0-f71.google.com (mail-it0-f71.google.com [209.85.214.71]) by kanga.kvack.org (Postfix) with ESMTP id BBAEA6B0069 for ; Fri, 16 Sep 2016 14:33:01 -0400 (EDT) Received: by mail-it0-f71.google.com with SMTP id u18so84732319ita.2 for ; Fri, 16 Sep 2016 11:33:01 -0700 (PDT) Received: from mail-oi0-x22d.google.com (mail-oi0-x22d.google.com. [2607:f8b0:4003:c06::22d]) by mx.google.com with ESMTPS id l3si12027069otd.292.2016.09.16.11.33.00 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 16 Sep 2016 11:33:00 -0700 (PDT) Received: by mail-oi0-x22d.google.com with SMTP id q188so121794747oia.3 for ; Fri, 16 Sep 2016 11:33:00 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: <20160916132506.GB5035@twins.programming.kicks-ass.net> References: <1473415175-20807-1-git-send-email-mgorman@techsingularity.net> <1473415175-20807-2-git-send-email-mgorman@techsingularity.net> <20160916132506.GB5035@twins.programming.kicks-ass.net> From: Linus Torvalds Date: Fri, 16 Sep 2016 11:33:00 -0700 Message-ID: Subject: Re: [PATCH 1/4] mm, vmscan: Batch removal of mappings under a single lock during reclaim Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Peter Zijlstra Cc: Mel Gorman , LKML , Linux-MM , Dave Chinner , Ying Huang , Michal Hocko On Fri, Sep 16, 2016 at 6:25 AM, Peter Zijlstra wrote: > > So, once upon a time, in a galaxy far away,.. I did a concurrent > pagecache patch set that replaced the tree_lock with a per page bit- > spinlock and fine grained locking in the radix tree. I'd love to see the patch for that. I'd be a bit worried about extra locking in the trivial cases (ie multi-level locking when we now take just the single mapping lock), but if there is some smart reason why that doesn't happen, then.. Linus -- 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