Re: [PATCH v4 0/3] locking/rwsem: Rwsem rearchitecture part 0
From: Peter Zijlstra <peterz@infradead.org>
Date: 2019-02-14 10:37:44
Also in:
linux-alpha, linux-arch, linux-arm-kernel, linux-mips, linux-riscv, linux-s390, linux-sh, linux-um, lkml, sparclinux
On Wed, Feb 13, 2019 at 05:00:14PM -0500, Waiman Long wrote:
v4:
- Remove rwsem-spinlock.c and make all archs use rwsem-xadd.c.
v3:
- Optimize __down_read_trylock() for the uncontended case as suggested
by Linus.
v2:
- Add patch 2 to optimize __down_read_trylock() as suggested by PeterZ.
- Update performance test data in patch 1.
The goal of this patchset is to remove the architecture specific files
for rwsem-xadd to make it easer to add enhancements in the later rwsem
patches. It also removes the legacy rwsem-spinlock.c file and make all
the architectures use one single implementation of rwsem - rwsem-xadd.c.
Waiman Long (3):
locking/rwsem: Remove arch specific rwsem files
locking/rwsem: Remove rwsem-spinlock.c & use rwsem-xadd.c for all
archs
locking/rwsem: Optimize down_read_trylock()Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> with the caveat that I'm happy to exchange patch 3 back to my earlier suggestion in case Will expesses concerns wrt the ARM64 performance of Linus' suggestion.