Messages in this thread | | | Date | Tue, 22 Apr 2008 16:19:09 +0200 | From | Ingo Molnar <> | Subject | Re: [PATCH] Fix x86_64 page fault scheduler race |
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* Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> wrote:
> > the scheduler disables interrupts around __switch_to(). (x86 does > > not set __ARCH_WANT_INTERRUPTS_ON_CTXSW) > > Ok, so I guess it's only useful to NMIs then. However, it makes me > wonder why this comment was there in the first place on x86_32 > vmalloc_fault() and why it uses read_cr3() : > > * Do _not_ use "current" here. We might be inside > * an interrupt in the middle of a task switch..
hm, i guess it's still useful to keep the __ARCH_WANT_INTERRUPTS_ON_CTXSW case working too. On -rt we used to enable it to squeeze a tiny bit more latency out of the system.
Ingo
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