linux-kernel - Re: [PATCH 17/18] fs: icache remove inode

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Date:	Wed, 13 Oct 2010 12:42:36 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Nick Piggin <npiggin@...nel.dk>
Cc:	Dave Chinner <david@...morbit.com>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 17/18] fs: icache remove inode_lock

Le mercredi 13 octobre 2010 à 18:20 +1100, Nick Piggin a écrit :

> 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.
> 

Hi Nick 

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


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