issue-{368,443}: allocate metadata in big batches

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It uses same approach as PageHeapAllocator. Namely allocates big chunk
which is then used to satisfy smaller allocations.

In issue-443 gradual heap grows causes old code that allocates
metadata in smaller pieces and thus more frequently to fragment the
heap. It's also causing most of 368 heap fragmentation too.

New code allocates 8 megs of address space at once for metadata
allocations. Most OSes will allocate actual memory only when
corresponding pages are touched. Thus this change should not cause
increased memory usage.

I've also made sure metadata is always properly aligned in case we
ever allocate something that breaks natural alignment. E.g. strings.



git-svn-id: http://gperftools.googlecode.com/svn/trunk@211 6b5cf1ce-ec42-a296-1ba9-69fdba395a50

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This commit is contained in:

alkondratenko@gmail.com 2013-05-06 19:50:23 +00:00

parent 4fd762cead

commit f25ac4421f

1 changed files with 49 additions and 4 deletions

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