Re: [PATCH 3/3] sl[auo]b: retry allocation once in case of failure.

On Wed, 19 Dec 2012, Glauber Costa wrote:

When we are out of space in the caches, we will try to allocate a new
page.  If we still fail, the page allocator will try to free pages
through direct reclaim. Which means that if an object allocation failed
we can be sure that no new pages could be given to us, even though
direct reclaim was likely invoked.

Well this hits the hot allocation path with lots of additional checks
that also require the touching of more cachelines.

How much impact will this have?

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