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    SubjectRe: [PATCH -mm 14/24] Ramfs and Ram Disk pages are unevictable
    Date
    On Thursday 12 June 2008 04:42, Rik van Riel wrote:
    > From: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
    >
    > Christoph Lameter pointed out that ram disk pages also clutter the
    > LRU lists. When vmscan finds them dirty and tries to clean them,
    > the ram disk writeback function just redirties the page so that it
    > goes back onto the active list. Round and round she goes...


    > Index: linux-2.6.26-rc5-mm2/drivers/block/brd.c
    > ===================================================================
    > --- linux-2.6.26-rc5-mm2.orig/drivers/block/brd.c 2008-06-10
    > 10:46:18.000000000 -0400 +++
    > linux-2.6.26-rc5-mm2/drivers/block/brd.c 2008-06-10 16:47:23.000000000
    > -0400 @@ -374,8 +374,21 @@ static int brd_ioctl(struct inode *inode
    > return error;
    > }
    >
    > +/*
    > + * brd_open():
    > + * Just mark the mapping as containing unevictable pages
    > + */
    > +static int brd_open(struct inode *inode, struct file *filp)
    > +{
    > + struct address_space *mapping = inode->i_mapping;
    > +
    > + mapping_set_unevictable(mapping);
    > + return 0;
    > +}
    > +
    > static struct block_device_operations brd_fops = {
    > .owner = THIS_MODULE,
    > + .open = brd_open,
    > .ioctl = brd_ioctl,
    > #ifdef CONFIG_BLK_DEV_XIP
    > .direct_access = brd_direct_access,

    This isn't the case for brd any longer. It doesn't use the buffer
    cache as its backing store, so the buffer cache is reclaimable.


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