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authorArseny Kapoulkine <arseny.kapoulkine@gmail.com>2014-06-01 19:12:36 +0000
committerArseny Kapoulkine <arseny.kapoulkine@gmail.com>2014-06-01 19:12:36 +0000
commit757c4943401d6a1922954cdac6ab8a901c8cbb51 (patch)
treee543fe4d2acd9e2b0edefbf694af6ca45032c454 /docs
parent6d43ad2870b9411c409fcd12937e02eb44b2a76c (diff)
Improve XPath allocator performance
When allocating new pages, make sure that the page has at least 1/4 of the base page size free. This makes sure that we can do small allocations after big allocations (i.e. huge node lists) without doing a heap alloc. This is important because XPath stack code always reclaims extra pages after evaluating sub-expressions, so allocating a small chunk of memory and then rolling the state back is a common case (filtering a node list using a predicate usually does this). A better solution involves smarter allocation rollback strategy, but the implemented solution is simple and practical. git-svn-id: https://pugixml.googlecode.com/svn/trunk@999 99668b35-9821-0410-8761-19e4c4f06640
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