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    Subject[PATCH 05/16] GFS2: Increase buffer size for glocks and glstats debugfs files
    Date
    As per Al Viro's suggestion, this increases the buffer size used
    for these two files. This provides a speed up of slightly less than
    8x (i.e. proportional to the buffer size) for cases when we have
    large numbers of glocks.

    Cc: Al Viro <viro@ZenIV.linux.org.uk>
    Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>

    diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
    index dab2526..1c4cddf 100644
    --- a/fs/gfs2/glock.c
    +++ b/fs/gfs2/glock.c
    @@ -1972,6 +1972,9 @@ static int gfs2_glocks_open(struct inode *inode, struct file *file)
    struct seq_file *seq = file->private_data;
    struct gfs2_glock_iter *gi = seq->private;
    gi->sdp = inode->i_private;
    + seq->buf = kmalloc(8*PAGE_SIZE, GFP_KERNEL | __GFP_NOWARN);
    + if (seq->buf)
    + seq->size = 8*PAGE_SIZE;
    }
    return ret;
    }
    @@ -1984,6 +1987,9 @@ static int gfs2_glstats_open(struct inode *inode, struct file *file)
    struct seq_file *seq = file->private_data;
    struct gfs2_glock_iter *gi = seq->private;
    gi->sdp = inode->i_private;
    + seq->buf = kmalloc(8*PAGE_SIZE, GFP_KERNEL | __GFP_NOWARN);
    + if (seq->buf)
    + seq->size = 8*PAGE_SIZE;
    }
    return ret;
    }
    --
    1.7.4


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