Hello, I'm an Outreachy intern working under Rik van Riel. My project is about latency tracing during memory allocation. The idea is to use tracepoints, both existing and new, to derive higher level information on memory allocation and identify where time was spent. This patchset which 1, adds a new field to struct shrinker to hold names of shrinkers, 2, updates the newly added field in instances of the struct, 3, changes tracepoint definitions to have the field displayed, would be useful when one wants to observe which shrinkers contributed to excessive latencies. A post processing script like the one here- https://github.com/Jananiravichandran/Analyzing-tracepoints/blob/master/shrink_slab_latencies.py , can use the new information this patchset adds to see which shrinkers were invoked and how long each of them took. Sample output: i915_gem_shrinker : 0.166 ms ext4_es_shrinker : 0.954 ms workingset_shadow_shrinker : 1.091 ms deferred_split_shrinker : 6.043 ms super_cache_shrinker : 84.218 ms total time spent in shrinkers = 92.472 ms This shows the various shrinkers called and the times spent. Janani Ravichandran (3): Add a new field to struct shrinker Update name field for all shrinker instances Add name fields in shrinker tracepoint definitions arch/x86/kvm/mmu.c | 1 + drivers/gpu/drm/i915/i915_gem_shrinker.c | 1 + drivers/gpu/drm/ttm/ttm_page_alloc.c | 1 + drivers/gpu/drm/ttm/ttm_page_alloc_dma.c | 1 + drivers/md/bcache/btree.c | 1 + drivers/md/dm-bufio.c | 1 + drivers/md/raid5.c | 1 + drivers/staging/android/ashmem.c | 1 + drivers/staging/android/ion/ion_heap.c | 1 + drivers/staging/android/lowmemorykiller.c | 1 + drivers/staging/lustre/lustre/ldlm/ldlm_pool.c | 1 + drivers/staging/lustre/lustre/obdclass/lu_object.c | 1 + drivers/staging/lustre/lustre/ptlrpc/sec_bulk.c | 1 + fs/ext4/extents_status.c | 1 + fs/f2fs/super.c | 1 + fs/gfs2/glock.c | 1 + fs/gfs2/quota.c | 1 + fs/mbcache.c | 1 + fs/nfs/super.c | 1 + fs/nfsd/nfscache.c | 1 + fs/quota/dquot.c | 1 + fs/super.c | 1 + fs/ubifs/super.c | 1 + fs/xfs/xfs_buf.c | 1 + fs/xfs/xfs_qm.c | 1 + include/linux/shrinker.h | 1 + include/trace/events/vmscan.h | 10 ++++++++-- mm/huge_memory.c | 2 ++ mm/workingset.c | 1 + mm/zsmalloc.c | 1 + net/sunrpc/auth.c | 1 + 31 files changed, 39 insertions(+), 2 deletions(-) -- 2.7.0 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>