On Mon, May 17, 2010 at 8:32 AM, Nitin Gupta <ngupta@xxxxxxxxxx> wrote: > Resending as Greg wanted. > > (tested on mainline but should apply to linux-next cleanly) > > > * Changelog: v2 vs initial patches > - directly add swap free callback to block_device_operations > instead of using 'notifiers' for various swap events. > > ramzswap driver creates RAM based block devices which can be > used (only) as swap disks. Pages swapped to these disks are > compressed and stored in memory itself. > > However, these devices do not get any notification when a swap > slot is freed (swap_map[i] reaches 0). So, we cannot free memory > allocated corresponding to this swap slot. Such stale data can > quickly accumulate in (compressed) memory defeating the whole > purpose of such devices. > > To overcome this problem, we now add a callback in struct > block_device_operations which is called as soon as a swap > slot is freed. > > Nitin Gupta (3): > Add flag to identify block swap devices > Add swap slot free callback to block_device_operations > ramzswap: Handler for swap slot free callback > > drivers/staging/ramzswap/TODO | 5 ----- > drivers/staging/ramzswap/ramzswap_drv.c | 22 +++++++++++++--------- > include/linux/blkdev.h | 2 ++ > include/linux/swap.h | 1 + > mm/swapfile.c | 5 +++++ > 5 files changed, 21 insertions(+), 14 deletions(-) > delete mode 100644 drivers/staging/ramzswap/TODO Nitin, please retain ACKs when resending patches. Acked-by: Pekka Enberg <penberg@xxxxxxxxxxxxxx> for the whole series. _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/devel
