x86/tsc: Remodel cyc2ns to use seqcount_latch()

Browse source

Replace the custom multi-value scheme with the more regular
seqcount_latch() scheme. Along with scrapping a lot of lines, the latch
scheme is better documented and used in more places.

The immediate benefit however is not being limited on the update side.
The current code has a limit where the writers block which is hit by
future changes.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

...

This commit is contained in:

Peter Zijlstra 2017-05-02 13:22:07 +02:00 • committed by Ingo Molnar

parent 8309f86cd4

commit 59eaef78bf

4 changed files with 53 additions and 154 deletions

Show all changes Ignore whitespace when comparing lines Ignore changes in amount of whitespace Ignore changes in whitespace at EOL

Download patch file Download diff file Expand all files Collapse all files

12

arch/x86/events/core.c

View file

8

arch/x86/include/asm/timer.h

View file

175

arch/x86/kernel/tsc.c

View file

14

arch/x86/platform/uv/tlb_uv.c

View file