Messages in this thread | | | Date | Thu, 30 Apr 2009 11:44:54 -0400 (EDT) | From | Christoph Lameter <> | Subject | Re: [PATCH] Fix dirty page accounting in redirty_page_for_writepage() |
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On Thu, 30 Apr 2009, Ingo Molnar wrote:
> nice. Do these all get called with irqs off, all the time?
In most cases yes. The VMstat patch includes an example were we may not care too much about a event counter missing a beat once in a while for platforms not supporting atomic per cpu ops. I know this affects IA64. The cost of an atomic operations for an event counter update (which would have avoided the potential of a concurrent update) was not justifiable.
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