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    SubjectRe: [PATCH 17/18] fs: icache remove inode_lock
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    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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