[lkml]   [2009]   [Apr]   [30]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [PATCH] Fix dirty page accounting in redirty_page_for_writepage()

On Thu, 30 Apr 2009, Ingo Molnar wrote:
> c0436275: 64 83 05 20 5f 6a c0 addl $0x1,%fs:0xc06a5f20
> There's no atomic instructions at all - the counters here are only
> accessed locally. They are local-irq-atomic, but not
> cacheline-atomic.

On other architectures, you need the whole "disable preemption,
load-locked, store-conditional, test-and-loop, enable preemption" thing.

Or "disable interrupts, load, store, restore interrupts".

There really aren't very many architectures that can do almost
unrestricted ALU ops in a single instruction (and thus automatically safe
from preemption and interrupts).


 \ /
  Last update: 2009-04-30 18:29    [W:0.051 / U:9.656 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site