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Groups > linux.kernel > #1291350
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) |
| Date | 2015-12-14 18:00 +0100 |
| Message-ID | <qFEDE-gS-7@gated-at.bofh.it> (permalink) |
| References | (3 earlier) <qEr5L-1BY-11@gated-at.bofh.it> <qExuy-69x-11@gated-at.bofh.it> <qFxCa-4ar-15@gated-at.bofh.it> <qFxLP-4dP-17@gated-at.bofh.it> <qFEki-9n-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Tue, Dec 15, 2015 at 01:38:30AM +0900, Namhyung Kim wrote: > It requires many changes, but basically I also like the split-up since > it's easier to deal with. IIRC there was an opinion (Andi?) regarding > single-file vs multi-file. The file access will be better for single > file so I changed my earlier implementation to use indexed single data > file instead of multiple files. The page-cache has a lock per inode, so by having all CPUs populate the one file you get contention on that. Also, I suppose you'll have to arbitrate ranges in that file for each cpu to make it work, that too could get you some contention. Having a file per cpu avoids all that. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Peter Zijlstra <peterz@infradead.org> - 2015-12-14 10:30 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Ingo Molnar <mingo@kernel.org> - 2015-12-14 10:40 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) David Ahern <dsahern@gmail.com> - 2015-12-14 16:00 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 17:30 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Peter Zijlstra <peterz@infradead.org> - 2015-12-14 17:50 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 19:00 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Namhyung Kim <namhyung@kernel.org> - 2015-12-14 17:40 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Peter Zijlstra <peterz@infradead.org> - 2015-12-14 18:00 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Namhyung Kim <namhyung@kernel.org> - 2015-12-14 18:20 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) David Ahern <dsahern@gmail.com> - 2015-12-14 15:50 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Namhyung Kim <namhyung@kernel.org> - 2015-12-14 18:10 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Arnaldo Carvalho de Melo <acme@kernel.org> - 2015-12-14 19:00 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Namhyung Kim <namhyung@kernel.org> - 2015-12-14 17:30 +0100
Re: [PATCHSET 00/16] perf top: Add multi-thread support (v1) Peter Zijlstra <peterz@infradead.org> - 2015-12-14 17:50 +0100
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