Re: [PATCH 17/18] mm, hugetlb: retry if we fail to allocate ahugepage with use_reserve

From: Joonsoo Kim
Date: Mon Aug 05 2013 - 03:36:43 EST

> Any mapping that doesn't use the reserved pool, not just
> MAP_NORESERVE. For example, if a process makes a MAP_PRIVATE mapping,
> then fork()s then the mapping is instantiated in the child, that will
> not draw from the reserved pool.
> > Should we ensure them to allocate the last hugepage?
> > They map a region with MAP_NORESERVE, so don't assume that their requests
> > always succeed.
> If the pages are available, people get cranky if it fails for no
> apparent reason, MAP_NORESERVE or not. They get especially cranky if
> it sometimes fails and sometimes doesn't due to a race condition.


Hmm... Okay. I will try to implement another way to protect race condition.
Maybe it is the best to use a table mutex :)
Anyway, please give me a time, guys.

Really thank you for pointing that.
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