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NFS: Reduce lock contention in nfs_page_find_head_request()
Add a lockless check for whether or not the page might be carrying an existing writeback before we grab the inode->i_lock. Reported-by: Chuck Lever <chuck.lever@oracle.com> Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
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1 changed files with 5 additions and 3 deletions
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@ -190,9 +190,11 @@ static struct nfs_page *nfs_page_find_head_request(struct page *page)
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struct inode *inode = page_file_mapping(page)->host;
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struct nfs_page *req = NULL;
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if (PagePrivate(page) || PageSwapCache(page)) {
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spin_lock(&inode->i_lock);
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req = nfs_page_find_head_request_locked(NFS_I(inode), page);
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spin_unlock(&inode->i_lock);
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}
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return req;
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}
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