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Subject[PATCH 0/9] readahead stats/tracing, backwards prefetching and more (v4)
Andrew,

Will you include it into the -mm tree?

This introduces the per-cpu readahead stats, tracing, backwards prefetching,
fixes context readahead for SSD random reads and does some other minor changes.

Changes since v3:
- default to CONFIG_READAHEAD_STATS=n
- drop "block: limit default readahead size for small devices"
(and expect some distro udev rules to do the job)
- use percpu_counter for the readahead stats

Changes since v2:
- use per-cpu counters for readahead stats
- make context readahead more conservative
- simplify readahead tracing format and use __print_symbolic()
- backwards prefetching and snap to EOF fixes and cleanups

Changes since v1:
- use bit fields: pattern, for_mmap, for_metadata, lseek
- comment the various readahead patterns
- drop boot options "readahead=" and "readahead_stats="
- add for_metadata
- add snapping to EOF

[PATCH 1/9] readahead: make context readahead more conservative
[PATCH 2/9] readahead: record readahead patterns
[PATCH 3/9] readahead: tag mmap page fault call sites
[PATCH 4/9] readahead: tag metadata call sites
[PATCH 5/9] readahead: add vfs/readahead tracing event
[PATCH 6/9] readahead: add /debug/readahead/stats
[PATCH 7/9] readahead: basic support for backwards prefetching
[PATCH 8/9] readahead: dont do start-of-file readahead after lseek()
[PATCH 9/9] readahead: snap readahead request to EOF

fs/Makefile | 1
fs/ext3/dir.c | 1
fs/ext4/dir.c | 1
fs/read_write.c | 3
fs/trace.c | 2
include/linux/fs.h | 41 ++++
include/linux/mm.h | 4
include/trace/events/vfs.h | 78 ++++++++
mm/Kconfig | 15 +
mm/filemap.c | 9 -
mm/readahead.c | 310 +++++++++++++++++++++++++++++++++--
11 files changed, 450 insertions(+), 15 deletions(-)

Thanks,
Fengguang




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