readahead stats/tracing, backwards prefetching and more (v3)
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b4 am [email protected]Versions newest first
- v1 Latest10 patches 0 repliesNew
Changes since v2 from the cover letter
- 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
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/10 | block: limit default readahead size for small devicesblock/ | +20 | 0 replies | |
| 2/10 | readahead: make context readahead more conservativemm/ | +4 | 0 replies | |
| 3/10 | readahead: record readahead patternsinclude/ include/ mm/ +1 more | +62 | 0 replies | |
| 4/10 | readahead: tag mmap page fault call sitesinclude/ mm/ mm/ | +7 | 0 replies | |
| 5/10 | readahead: tag metadata call sitesfs/ fs/ include/ +1 more | +4 | 0 replies | |
| 6/10 | readahead: add vfs/readahead tracing eventfs/ fs/ include/ +1 more | +104 | 0 replies | |
| 7/10 | readahead: add /debug/readahead/statsmm/ mm/ | +208 | 2 replies | |
| 8/10 | readahead: basic support for backwards prefetchinginclude/ include/ mm/ | +23 | 0 replies | |
| 9/10 | readahead: dont do start-of-file readahead after lseek()fs/ include/ mm/ | +8 | 0 replies | |
| 10/10 | readahead: snap readahead request to EOFmm/ | +21 | 0 replies |
Reviews trailers per patch
9 of 10 patches have a Reviewed-by or Acked-by.
| Patch | Jens Axboe | Rik van Riel | Vivek Goyal | Linus Torvalds | Tao Ma | Jan Kara | Steven Rostedt |
|---|---|---|---|---|---|---|---|
| 1/10 | A-b | A-b | T-b | T-b | |||
| 2/10 | T-b | ||||||
| 3/10 | A-b | A-b | |||||
| 4/10 | A-b | ||||||
| 5/10 | A-b | ||||||
| 6/10 | A-b | A-b | A-b | ||||
| 7/10 | A-b A-b | A-b | |||||
| 8/10 | A-b | ||||||
| 9/10 | A-b | A-b | |||||
| 10/10 | A-b |
Trailers given in replies are filled; those carried in the patches from earlier versions are outlined with dashes. Scroll the table sideways for all 7 reviewers.
Cover letter [PATCH 00/10] readahead stats/tracing, backwards prefetching and more (v3)
Andrew,
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 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 01/10] block: limit default readahead size for small devices [PATCH 02/10] readahead: make context readahead more conservative [PATCH 03/10] readahead: record readahead patterns
[PATCH 04/10] readahead: tag mmap page fault call sites [PATCH 05/10] readahead: tag metadata call sites
[PATCH 06/10] readahead: add vfs/readahead tracing event [PATCH 07/10] readahead: add /debug/readahead/stats
[PATCH 08/10] readahead: basic support for backwards prefetching [PATCH 09/10] readahead: dont do start-of-file readahead after lseek() [PATCH 10/10] readahead: snap readahead request to EOF
block/genhd.c | 20 ++ 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 | 301 +++++++++++++++++++++++++++++++++-- 12 files changed, 461 insertions(+), 15 deletions(-)
Thanks,
Fengguang
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