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| Started by | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| First post | 2016-04-23 00:00 +0200 |
| Last post | 2016-04-23 13:30 +0200 |
| Articles | 2 — 2 participants |
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Re: [PATCH] mm/vmalloc: Keep a separate lazy-free list Andrew Morton <akpm@linux-foundation.org> - 2016-04-23 00:00 +0200
Re: [PATCH] mm/vmalloc: Keep a separate lazy-free list Roman Peniaev <r.peniaev@gmail.com> - 2016-04-23 13:30 +0200
| From | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| Date | 2016-04-23 00:00 +0200 |
| Subject | Re: [PATCH] mm/vmalloc: Keep a separate lazy-free list |
| Message-ID | <rqRhh-pl-49@gated-at.bofh.it> |
On Fri, 15 Apr 2016 12:14:31 +0100 Chris Wilson <chris@chris-wilson.co.uk> wrote: > > > purge_fragmented_blocks() manages per-cpu lists, so that looks safe > > > under its own rcu_read_lock. > > > > > > Yes, it looks feasible to remove the purge_lock if we can relax sync. > > > > what is still left is waiting on vmap_area_lock for !sync mode. > > but probably is not that bad. > > Ok, that's bit beyond my comfort zone with a patch to change the free > list handling. I'll chicken out for the time being, atm I am more > concerned that i915.ko may call set_page_wb() frequently on individual > pages. Nick Piggin's vmap rewrite. 20x (or more) faster. https://lwn.net/Articles/285341/ 10 years ago, never finished.
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| From | Roman Peniaev <r.peniaev@gmail.com> |
|---|---|
| Date | 2016-04-23 13:30 +0200 |
| Message-ID | <rr3V8-2ca-7@gated-at.bofh.it> |
| In reply to | #1385487 |
On Fri, Apr 22, 2016 at 11:49 PM, Andrew Morton <akpm@linux-foundation.org> wrote: > On Fri, 15 Apr 2016 12:14:31 +0100 Chris Wilson <chris@chris-wilson.co.uk> wrote: > >> > > purge_fragmented_blocks() manages per-cpu lists, so that looks safe >> > > under its own rcu_read_lock. >> > > >> > > Yes, it looks feasible to remove the purge_lock if we can relax sync. >> > >> > what is still left is waiting on vmap_area_lock for !sync mode. >> > but probably is not that bad. >> >> Ok, that's bit beyond my comfort zone with a patch to change the free >> list handling. I'll chicken out for the time being, atm I am more >> concerned that i915.ko may call set_page_wb() frequently on individual >> pages. > > Nick Piggin's vmap rewrite. 20x (or more) faster. > https://lwn.net/Articles/285341/ > > 10 years ago, never finished. But that's exactly what we are changing making 20.5x faster :) -- Roman
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