Re: [PATCH 3/3] Page Fault Scalability V20: Avoid lock for anonymouswrite fault

From: Christoph Lameter
Date: Fri Apr 29 2005 - 18:08:52 EST

On Fri, 29 Apr 2005, Christoph Hellwig wrote:

> On Fri, Apr 29, 2005 at 12:59:17PM -0700, Christoph Lameter wrote:
> > Do not use the page_table_lock in do_anonymous_page. This will significantly
> > increase the parallelism in the page fault handler for SMP systems. The patch
> > also modifies the definitions of _mm_counter functions so that rss and anon_rss
> > become atomic (and will use atomic64_t if available).
> I thought we said all architectures should provide an atomic64_t (and
> given that it's not actually 64bit on 32bit architecture we should
> probably rename it to atomic_long_t)

Yes the way atomic types are provided may need a revision.
First of all we need atomic types that are size bound


and (if available)


and then some aliases

atomic_t -> atomic type for int
atomic_long_t -> atomic type for long

If these types are available then this patch could be cleaned up to
just use atomic_long_t.
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