readahead stats/tracing, backwards prefetching and more
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b4 am [email protected]Versions newest first
- v1 Latest8 patches 40 repliesIn review
Patches in v1 No applies recorded yet
| # | Subject and files | Size | Replies | Applied |
|---|---|---|---|---|
| 1/8 | block: limit default readahead size for small devicesblock/ | +20 | 7 replies | |
| 2/8 | readahead: make default readahead size a kernel parameterDocumentation/ block/ fs/ +1 more | +27 | 10 replies | |
| 3/8 | readahead: replace ra->mmap_miss with ra->ra_flagsinclude/ mm/ | +32 | 6 replies | |
| 4/8 | readahead: record readahead patternsinclude/ include/ mm/ +1 more | +66 | 2 replies | |
| 5/8 | readahead: add /debug/readahead/statsDocumentation/ mm/ mm/ | +215 | 8 replies | |
| 6/8 | readahead: add debug tracing eventinclude/ mm/ | +69 | 1 reply | |
| 7/8 | readahead: basic support for backwards prefetchinginclude/ mm/ | +15 | 2 replies | |
| 8/8 | readahead: dont do start-of-file readahead after lseek()fs/ include/ mm/ | +8 | 2 replies |
Reviews trailers per patch
7 of 8 patches have a Reviewed-by or Acked-by.
| Patch | Jens Axboe | Rik van Riel | Vivek Goyal | Linus Torvalds | Steven Whitehouse | Steven Rostedt |
|---|---|---|---|---|---|---|
| 1/8 | A-b A-b | A-b A-b | T-b T-b | T-b T-b | ||
| 2/8 | A-b | |||||
| 3/8 | A-b | A-b | ||||
| 4/8 | A-b | |||||
| 5/8 | A-b A-b | |||||
| 6/8 | A-b | A-b | ||||
| 7/8 | ||||||
| 8/8 | A-b | 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 6 reviewers.
Cover letter [PATCH 0/8] readahead stats/tracing, backwards prefetching and more
Andrew,
I'm getting around to pick up the readahead works again :-)
This first series is mainly to add some debug facilities, to support the long missed backwards prefetching capability, and some old patches that somehow get delayed (shame me).
The next step would be to better handle the readahead thrashing situations. That would require rewriting part of the algorithms, this is why I'd like to keep the backwards prefetching simple and stupid for now.
When (almost) free of readahead thrashing, we'll be in a good position to lift the default readahead size. Which I suspect would be the single most efficient way to improve performance for the large volumes of casually maintained Linux file servers.
Thanks,
Fengguang
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