[PATCH 0/3] ramzswap: Eliminate stale data from compressed memory (v2)
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From: Nitin Gupta on 7 May 2010 03:30 (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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |