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There's a rare case which leads to stagnation in the defragger, causing
it to keep scanning the keyspace and do nothing (not moving any
allocation), this happens when all the allocator slabs of a certain bin
have the same % utilization, but the slab from which new allocations are
made have a lower utilization.
this commit fixes it by removing the current slab from the overall
average utilization of the bin, and also eliminate any precision loss in
the utilization calculation and move the decision about the defrag to
reside inside jemalloc.
and also add a test that consistently reproduce this issue.
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Background threads may run for a long time, especially when the # of dirty pages
is high. Avoid blocking stats calls because of this (which may cause latency
spikes).
see https://github.com/jemalloc/jemalloc/issues/1502
cherry picked from commit 1a71533511027dbe3f9d989659efeec446915d6b
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* overflow in jemalloc fragmentation hint to the defragger
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problems fixed:
* failing to read fragmentation information from jemalloc
* overflow in jemalloc fragmentation hint to the defragger
* test suite not triggering eviction after population
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This reverts commit 36c1acc222d29e6e2dc9fc25362e4faa471111bd.
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The original jemalloc source tree was modified to:
1. Remove the configure error that prevents nested builds.
2. Insert the Redis private Jemalloc API in order to allow the
Redis fragmentation function to work.
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This commit also includes minor aesthetic changes like removal of
trailing spaces.
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Now way to make unmodified Jemalloc configure to work when the jemalloc
source tree is inside a subdirectory of a different git repository.
Problem signaled here:
http://www.canonware.com/pipermail/jemalloc-discuss/2015-October/001174.html
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This gives us a 24 bytes size class which is dict.c dictEntry size, thus
improving the memory efficiency of Redis significantly.
Moreover other non 16 bytes aligned tiny classes are added that further
reduce the fragmentation of the allocator.
Technically speaking LG_QUANTUM should be 4 on i386 / AMD64 because of
SSE types and other 16 bytes types, however we don't use those, and our
jemalloc only targets Redis.
New versions of Jemalloc will have an explicit configure switch in order
to specify the quantum value for a platform without requiring any change
to the Jemalloc source code: we'll switch to this system when available.
This change was originally proposed by Oran Agra (@oranagra) as a change
to the Jemalloc script to generate the size classes define. We ended
doing it differently by changing LG_QUANTUM since it is apparently the
supported Jemalloc method to obtain a 24 bytes size class, moreover it
also provides us other potentially useful size classes.
Related to issue #2510.
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Not a single bug in about 3 months, and our previous version was
too old (3.2.0).
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Redis gitignore was too aggressive since simply broken.
Jemalloc gitignore was too agressive because it is conceived to just
keep the files that allow to generate all the rest in development
environments (so for instance the "configure" file is excluded).
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Full changelog here:
http://www.canonware.com/cgi-bin/gitweb.cgi?p=jemalloc.git;a=blob_plain;f=ChangeLog;hb=master
Notable improvements from the point of view of Redis:
1) Bugfixing.
2) Support for Valgrind.
3) Support for OSX Lion, FreeBSD.
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