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Fix/enhance THP integration.

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Detect whether chunks start off as THP-capable by default (according to
the state of /sys/kernel/mm/transparent_hugepage/enabled), and use this
as the basis for whether to call pages_nohuge() once per chunk during
first purge of any of the chunk's page runs.

Add the --disable-thp configure option, as well as the the opt.thp
mallctl.

This resolves #541.
This commit is contained in:
Jason Evans 2017-02-28 01:08:28 -08:00
parent 766ddcd0f2
commit d84d2909c3
13 changed files with 177 additions and 21 deletions
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7
INSTALL
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@ -157,6 +157,13 @@ any of the following arguments (not a definitive list) to 'configure':
released in bulk, thus reducing the total number of mutex operations. See
the "opt.tcache" option for usage details.
--disable-thp
Disable transparent huge page (THP) integration. On systems with THP
support, THPs are explicitly disabled as a side effect of unused dirty page
purging for chunks that back small and/or large allocations, because such
chunks typically comprise active, unused dirty, and untouched clean
pages.
--disable-munmap
Disable virtual memory deallocation via munmap(2); instead keep track of
the virtual memory for later use. munmap() is disabled by default (i.e.