Hi all, Here is my third try to implement the second step of extent status tree. The first step has been applied into upstream kernel. In the second step, extent status tree will track all extent status, and it will be as a extent cache for extent tree. Thus, we can first try to lookup a block mapping in this tree before accessing extent tree. Meanwhile we add nr_cached_objects() and free_cached_objects() callback functions to try to reclaim extents from the extent status tree under a heavy memory pressure because fragmented extent tree causes that extent status tree costs too much memory. This patch series is also sent to linux-fsdevel mailing list because we want to change prune_super() function so that we could avoid to reclaim too many cached objects. changelog: v3 <- v2: - use prune_super() to reclaim extents from extent status tree - stashed es_status into es_pblk - remove single extent cache - rebase against 3.8-rc4 v2 <- v1: - drop patches that try to improve unwritten extent conversion - remove EXT4_MAP_FROM_CLUSTER flag - add tracepoint for ext4_es_lookup_extent() - drop a patch, which tries to fix a warning when bigalloc and delalloc are enabled - add a shrinker to reclaim memory from extent status tree - rebase against 3.8-rc2 v2: http://lwn.net/Articles/532446/ v1: http://lwn.net/Articles/531065/ Any comments or feedbacks are welcome. Regards, - Zheng Theodore Ts'o (1): fs: allow for fs-specific objects to be pruned as part of pruning inodes Zheng Liu (9): ext4: refine extent status tree ext4: remove EXT4_MAP_FROM_CLUSTER flag ext4: add physical block and status member into extent status tree ext4: adjust interfaces of extent status tree ext4: track all extent status in extent status tree ext4: lookup block mapping in extent status tree ext4: remove single extent cache ext4: adjust some functions for reclaiming extents from extent status tree ext4: reclaim extents from extent status tree fs/ext4/ext4.h | 33 +-- fs/ext4/ext4_extents.h | 6 - fs/ext4/extents.c | 256 ++++---------------- fs/ext4/extents_status.c | 554 ++++++++++++++++++++++++++++++++------------ fs/ext4/extents_status.h | 50 +++- fs/ext4/file.c | 14 +- fs/ext4/inode.c | 138 ++++++++--- fs/ext4/move_extent.c | 3 - fs/ext4/super.c | 20 +- fs/super.c | 22 +- include/trace/events/ext4.h | 158 ++++++++++--- 11 files changed, 783 insertions(+), 471 deletions(-) -- 1.7.12.rc2.18.g61b472e -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
