From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: [PATCH 17/18] fs: icache remove inode_lock Date: Wed, 13 Oct 2010 12:42:36 +0200 Message-ID: <1286966556.3876.261.camel@edumazet-laptop> References: <1286515292-15882-1-git-send-email-david@fromorbit.com> <1286515292-15882-18-git-send-email-david@fromorbit.com> <20101013072058.GA3121@amd> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Dave Chinner , linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org To: Nick Piggin Return-path: In-Reply-To: <20101013072058.GA3121@amd> Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-fsdevel.vger.kernel.org Le mercredi 13 octobre 2010 =C3=A0 18:20 +1100, Nick Piggin a =C3=A9cri= t : > I don't think the patchset has suddenly become vastly more urgent > in the past month, so I think my approach of having it get a lot > of testing and go in Al's vfs tree for a while is best. >=20 Hi Nick=20 Not vastly urgent, but highly wanted on many workloads, even ones not really related to 'fs'... In current tree, a "close(socket())" needs 31 us on a 2x4x2 machine, instead of 1.45 us if single thread. But yes, I agree a lot of testing is needed :) -----------------------------------------------------------------------= --------------------- PerfTop: 16584 irqs/sec kernel:99.8% exact: 0.0% [1000Hz cycles= ], (all, 16 CPUs) -----------------------------------------------------------------------= --------------------- samples pcnt function DSO _______ _____ ________________________ _______ 101217.00 87.8% _raw_spin_lock vmlinux 1365.00 1.2% kmem_cache_alloc vmlinux 1220.00 1.1% d_alloc vmlinux 1159.00 1.0% sock_alloc_file vmlinux 881.00 0.8% __d_instantiate vmlinux 657.00 0.6% memset vmlinux 516.00 0.4% dput vmlinux 423.00 0.4% new_inode vmlinux 401.00 0.3% _atomic_dec_and_lock vmlinux 397.00 0.3% iput vmlinux 358.00 0.3% dentry_iput vmlinux 320.00 0.3% kmem_cache_free vmlinux 309.00 0.3% __slab_free vmlinux 297.00 0.3% __sk_free vmlinux 264.00 0.2% kmem_cache_alloc_notrace vmlinux 263.00 0.2% __call_rcu vmlinux Thanks