tree 1cd03f794c08ff3a86b16c0850d478aa24206b31
parent 07829f27ec5fee73845830d0d090a9c009c6b459
author John Stiles <johnstiles@google.com> 1603295375 +0000
committer Skia Commit-Bot <skia-commit-bot@chromium.org> 1603295413 +0000

Revert "Create a basic IRNode pooling system."

This reverts commit e16eca95f5c08c2bdf72cc0b04af62a1071afd8d.

Reason for revert: ASAN error on fuzzer

https://status.skia.org/logs/snBeMRUkDrwDYbnm2SAG/7ad38736-d579-4e94-bc10-87c002f3f7d6/fd7b6ea1-5d36-4612-85d1-88462a5271f7

Original change's description:
> Create a basic IRNode pooling system.
>
> Allocations are redirected by overriding `operator new` and `operator
> delete` on the IRNode class. This allows us to use our existing
> `unique_ptr` and `make_unique` calls as-is. The Pool class is simple;
> it holds a fixed number of nodes and recycles them as they are returned.
>
> A fixed pool size of 2000 nodes was chosen. That is large enough to hold
> the contents of `sksl_large` during compilation, but it can be
> overflowed by very large shaders, or if multiple programs are converted
> at the same time. Exhausting the pool is not a problem; if this happens,
> additional nodes will be allocated via the system allocator as usual.
> More elaborate schemes are possible but might not add a lot of value.
>
> Thread safety is accomplished by placing the pool in a `thread_local`
> static during a Program's creation and destruction; the pool is freed
> when the program is destroyed. One important consequence of this
> strategy is that a program must free every node that it allocated during
> its creation, or else the node will be leaked. In debug, leaking a node
> will be detected and causes a DEBUGFAIL. In release, the pool will be
> freed despite having a live node in it, and if that node is later freed,
> that pointer will be passed to the system `free` (which is likely to
> cause a crash).
>
> In this CL, iOS does not support pooling, since support for
> `thread_local` was only added on iOS 9. This is fixed in the followup
> CL, http://review.skia.org/328837, which uses pthread keys on iOS.
>
> Nanobench shows ~15% improvement:
>   (last week) http://screen/5CNBhTaZApcDA8h
>       (today) http://screen/8ti5Rymvf6LUs8i
>
> Change-Id: I559de73606ee1be54e5eae7f82129dc928a63e3c
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/326876
> Commit-Queue: John Stiles <johnstiles@google.com>
> Reviewed-by: Ethan Nicholas <ethannicholas@google.com>
> Auto-Submit: John Stiles <johnstiles@google.com>

TBR=brianosman@google.com,ethannicholas@google.com,johnstiles@google.com

Change-Id: I625d95a14057727b297c0bfc5b98bcd78ad8572c
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/328906
Reviewed-by: John Stiles <johnstiles@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>