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Groups > linux.kernel > #1491640
| From | Eric Dumazet <eric.dumazet@gmail.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2] fs/select: add vmalloc fallback for select(2) |
| Date | 2016-09-27 03:40 +0200 |
| Message-ID | <slPxf-34m-3@gated-at.bofh.it> (permalink) |
| References | <skfma-lq-23@gated-at.bofh.it> <slO89-2cZ-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Mon, 2016-09-26 at 17:01 -0700, Andrew Morton wrote: > I don't share Eric's concerns about performance here. If the vmalloc() > is called, we're about to write to that quite large amount of memory > which we just allocated, and the vmalloc() overhead will be relatively > low. I did not care of the performance of this particular select() system call really, but other cpus because of more TLB invalidations. At least CONFIG_DEBUG_PAGEALLOC=y builds should be impacted, but maybe we do not care.
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Re: [PATCH v2] fs/select: add vmalloc fallback for select(2) Andrew Morton <akpm@linux-foundation.org> - 2016-09-27 02:10 +0200
Re: [PATCH v2] fs/select: add vmalloc fallback for select(2) Eric Dumazet <eric.dumazet@gmail.com> - 2016-09-27 03:40 +0200
Re: [PATCH v2] fs/select: add vmalloc fallback for select(2) Vlastimil Babka <vbabka@suse.cz> - 2016-09-27 10:20 +0200
Re: [PATCH v2] fs/select: add vmalloc fallback for select(2) Eric Dumazet <eric.dumazet@gmail.com> - 2016-09-27 15:40 +0200
Re: [PATCH v2] fs/select: add vmalloc fallback for select(2) Vlastimil Babka <vbabka@suse.cz> - 2016-09-27 10:10 +0200
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