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    SubjectRe: [PATCH 14/14] tmpfs: no need to use i_lock
    On Mon, 2011-05-30 at 17:55 -0700, Hugh Dickins wrote:
    > 2.6.36's 7e496299d4d2 to make tmpfs scalable with percpu_counter used
    > inode->i_lock in place of sbinfo->stat_lock around i_blocks updates;
    > but that was adverse to scalability, and unnecessary, since info->lock
    > is already held there in the fast paths.
    > Remove those uses of i_lock, and add info->lock in the three error
    > paths where it's then needed across shmem_free_blocks(). It's not
    > actually needed across shmem_unacct_blocks(), but they're so often
    > paired that it looks wrong to split them apart.
    > Signed-off-by: Hugh Dickins <>
    > Cc: Tim Chen <>
    > ---


    Tim Chen

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