Commit Graph

103 Commits

Author SHA1 Message Date
Jason Evans
4731cd47f7 Allow chunks to not be naturally aligned.
Precisely size extents for huge size classes that aren't multiples of
chunksize.
2016-06-03 12:27:41 -07:00
Jason Evans
741967e79d Remove CHUNK_ADDR2BASE() and CHUNK_ADDR2OFFSET(). 2016-06-03 12:27:41 -07:00
Jason Evans
760bf11b23 Add extent_dirty_[gs]et(). 2016-06-03 12:27:41 -07:00
Jason Evans
47613afc34 Convert rtree from per chunk to per page.
Refactor [de]registration to maintain interior rtree entries for slabs.
2016-06-03 12:27:41 -07:00
Jason Evans
5c6be2bdd3 Refactor chunk_purge_wrapper() to take extent argument. 2016-06-03 12:27:41 -07:00
Jason Evans
0eb6f08959 Refactor chunk_[de]commit_wrapper() to take extent arguments. 2016-06-03 12:27:41 -07:00
Jason Evans
6c94470822 Refactor chunk_dalloc_{cache,wrapper}() to take extent arguments.
Rename arena_extent_[d]alloc() to extent_[d]alloc().

Move all chunk [de]registration responsibility into chunk.c.
2016-06-03 12:27:41 -07:00
Jason Evans
de0305a7f3 Add/use chunk_split_wrapper().
Remove redundant ptr/oldsize args from huge_*().

Refactor huge/chunk/arena code boundaries.
2016-06-03 12:27:41 -07:00
Jason Evans
1ad060584f Add/use chunk_merge_wrapper(). 2016-06-03 12:27:41 -07:00
Jason Evans
384e88f451 Add/use chunk_commit_wrapper(). 2016-06-03 12:27:41 -07:00
Jason Evans
56e0031d7d Add/use chunk_decommit_wrapper(). 2016-06-03 12:27:41 -07:00
Jason Evans
4d2d9cec5a Merge chunk_alloc_base() into its only caller. 2016-06-03 12:27:41 -07:00
Jason Evans
fc0372a15e Replace extent_tree_szad_* with extent_heap_*. 2016-06-03 12:27:41 -07:00
Jason Evans
ffa45a5331 Use rtree rather than [sz]ad trees for chunk split/coalesce operations. 2016-06-03 12:27:41 -07:00
Jason Evans
93e79c5c3f Remove redundant chunk argument from chunk_{,de,re}register(). 2016-06-03 12:27:41 -07:00
Jason Evans
d78846c989 Replace extent_achunk_[gs]et() with extent_slab_[gs]et(). 2016-06-03 12:27:41 -07:00
Jason Evans
fae8344098 Add extent_active_[gs]et().
Always initialize extents' runs_dirty and chunks_cache linkage.
2016-06-03 12:27:41 -07:00
Jason Evans
b2a9fae886 Set/unset rtree node for last chunk of extents.
Set/unset rtree node for last chunk of extents, so that the rtree can be
used for chunk coalescing.
2016-06-03 12:27:41 -07:00
Jason Evans
8c9be3e837 Refactor rtree to always use base_alloc() for node allocation. 2016-06-03 12:27:41 -07:00
Jason Evans
db72272bef Use rtree-based chunk lookups rather than pointer bit twiddling.
Look up chunk metadata via the radix tree, rather than using
CHUNK_ADDR2BASE().

Propagate pointer's containing extent.

Minimize extent lookups by doing a single lookup (e.g. in free()) and
propagating the pointer's extent into nearly all the functions that may
need it.
2016-06-03 12:27:41 -07:00
Jason Evans
2d2b4e98c9 Add element acquire/release capabilities to rtree.
This makes it possible to acquire short-term "ownership" of rtree
elements so that it is possible to read an extent pointer *and* read the
extent's contents with a guarantee that the element will not be modified
until the ownership is released.  This is intended as a mechanism for
resolving rtree read/write races rather than as a way to lock extents.
2016-06-03 12:27:33 -07:00
Jason Evans
a7a6f5bc96 Rename extent_node_t to extent_t. 2016-05-16 12:21:28 -07:00
Jason Evans
9a8add1510 Remove Valgrind support. 2016-05-13 09:56:18 -07:00
Jason Evans
c1e00ef2a6 Resolve bootstrapping issues when embedded in FreeBSD libc.
b2c0d6322d (Add witness, a simple online
locking validator.) caused a broad propagation of tsd throughout the
internal API, but tsd_fetch() was designed to fail prior to tsd
bootstrapping.  Fix this by splitting tsd_t into non-nullable tsd_t and
nullable tsdn_t, and modifying all internal APIs that do not critically
rely on tsd to take nullable pointers.  Furthermore, add the
tsd_booted_get() function so that tsdn_fetch() can probe whether tsd
bootstrapping is complete and return NULL if not.  All dangerous
conversions of nullable pointers are tsdn_tsd() calls that assert-fail
on invalid conversion.
2016-05-10 22:51:33 -07:00
Jason Evans
04c3c0f9a0 Add the stats.retained and stats.arenas.<i>.retained statistics.
This resolves #367.
2016-05-03 22:11:35 -07:00
Jason Evans
b2c0d6322d Add witness, a simple online locking validator.
This resolves #358.
2016-04-14 02:09:28 -07:00
Jason Evans
ce7c0f999b Fix potential chunk leaks.
Move chunk_dalloc_arena()'s implementation into chunk_dalloc_wrapper(),
so that if the dalloc hook fails, proper decommit/purge/retain cascading
occurs.  This fixes three potential chunk leaks on OOM paths, one during
dss-based chunk allocation, one during chunk header commit (currently
relevant only on Windows), and one during rtree write (e.g. if rtree
node allocation fails).

Merge chunk_purge_arena() into chunk_purge_default() (refactor, no
change to functionality).
2016-03-30 18:36:04 -07:00
buchgr
d412624b25 Move retaining out of default chunk hooks
This fixes chunk allocation to reuse retained memory even if an
application-provided chunk allocation function is in use.

This resolves #307.
2016-02-26 15:24:13 -08:00
Jason Evans
767d85061a Refactor arenas array (fixes deadlock).
Refactor the arenas array, which contains pointers to all extant arenas,
such that it starts out as a sparse array of maximum size, and use
double-checked atomics-based reads as the basis for fast and simple
arena_get().  Additionally, reduce arenas_lock's role such that it only
protects against arena initalization races.  These changes remove the
possibility for arena lookups to trigger locking, which resolves at
least one known (fork-related) deadlock.

This resolves #315.
2016-02-24 23:58:10 -08:00
Jason Evans
c7a9a6c86b Attempt mmap-based in-place huge reallocation.
Attempt mmap-based in-place huge reallocation by plumbing new_addr into
chunk_alloc_mmap().  This can dramatically speed up incremental huge
reallocation.

This resolves #335.
2016-02-24 17:23:18 -08:00
Jason Evans
9e1810ca9d Silence miscellaneous 64-to-32-bit data loss warnings. 2016-02-24 13:03:48 -08:00
Jason Evans
9f4ee6034c Refactor jemalloc_ffs*() into ffs_*().
Use appropriate versions to resolve 64-to-32-bit data loss warnings.
2016-02-24 13:03:48 -08:00
Jason Evans
56af64dc19 Fix a strict aliasing violation. 2015-08-12 16:38:20 -07:00
Jason Evans
6ed18cb348 Fix chunk_dalloc_arena() re: zeroing due to purge. 2015-08-12 15:20:34 -07:00
Jason Evans
de249c8679 Arena chunk decommit cleanups and fixes.
Decommit arena chunk header during chunk deallocation if the rest of the
chunk is decommitted.
2015-08-10 17:13:59 -07:00
Jason Evans
8fadb1a8c2 Implement chunk hook support for page run commit/decommit.
Cascade from decommit to purge when purging unused dirty pages, so that
it is possible to decommit cleaned memory rather than just purging.  For
non-Windows debug builds, decommit runs rather than purging them, since
this causes access of deallocated runs to segfault.

This resolves #251.
2015-08-07 00:50:58 -07:00
Jason Evans
b49a334a64 Generalize chunk management hooks.
Add the "arena.<i>.chunk_hooks" mallctl, which replaces and expands on
the "arena.<i>.chunk.{alloc,dalloc,purge}" mallctls.  The chunk hooks
allow control over chunk allocation/deallocation, decommit/commit,
purging, and splitting/merging, such that the application can rely on
jemalloc's internal chunk caching and retaining functionality, yet
implement a variety of chunk management mechanisms and policies.

Merge the chunks_[sz]ad_{mmap,dss} red-black trees into
chunks_[sz]ad_retained.  This slightly reduces how hard jemalloc tries
to honor the dss precedence setting; prior to this change the precedence
setting was also consulted when recycling chunks.

Fix chunk purging.  Don't purge chunks in arena_purge_stashed(); instead
deallocate them in arena_unstash_purged(), so that the dirty memory
linkage remains valid until after the last time it is used.

This resolves #176 and #201.
2015-08-03 21:49:02 -07:00
Jason Evans
d059b9d6a1 Implement support for non-coalescing maps on MinGW.
- Do not reallocate huge objects in place if the number of backing
  chunks would change.
- Do not cache multi-chunk mappings.

This resolves #213.
2015-07-24 18:39:14 -07:00
Jason Evans
aa2826621e Revert to first-best-fit run/chunk allocation.
This effectively reverts 97c04a9383 (Use
first-fit rather than first-best-fit run/chunk allocation.).  In some
pathological cases, first-fit search dominates allocation time, and it
also tends not to converge as readily on a steady state of memory
layout, since precise allocation order has a bigger effect than for
first-best-fit.
2015-07-15 17:15:19 -07:00
Jason Evans
b946086b08 Use jemalloc_ffs() rather than ffs(). 2015-07-07 20:16:25 -07:00
Matthijs
a1aaf949a5 Optimizations for Windows
- Set opt_lg_chunk based on run-time OS setting
- Verify LG_PAGE is compatible with run-time OS setting
- When targeting Windows Vista or newer, use SRWLOCK instead of CRITICAL_SECTION
- When targeting Windows Vista or newer, statically initialize init_lock
2015-06-25 22:53:58 +02:00
Jason Evans
4f6f2b131e Fix two valgrind integration regressions.
The regressions were never merged into the master branch.
2015-06-22 14:38:06 -07:00
Jason Evans
8d6a3e8321 Implement dynamic per arena control over dirty page purging.
Add mallctls:
- arenas.lg_dirty_mult is initialized via opt.lg_dirty_mult, and can be
  modified to change the initial lg_dirty_mult setting for newly created
  arenas.
- arena.<i>.lg_dirty_mult controls an individual arena's dirty page
  purging threshold, and synchronously triggers any purging that may be
  necessary to maintain the constraint.
- arena.<i>.chunk.purge allows the per arena dirty page purging function
  to be replaced.

This resolves #93.
2015-03-18 18:55:33 -07:00
Jason Evans
04ca7580db Fix a chunk_recycle() regression.
This regression was introduced by
97c04a9383 (Use first-fit rather than
first-best-fit run/chunk allocation.).
2015-03-06 23:25:13 -08:00
Jason Evans
97c04a9383 Use first-fit rather than first-best-fit run/chunk allocation.
This tends to more effectively pack active memory toward low addresses.
However, additional tree searches are required in many cases, so whether
this change stands the test of time will depend on real-world
benchmarks.
2015-03-06 20:21:41 -08:00
Jason Evans
5707d6f952 Quantize szad trees by size class.
Treat sizes that round down to the same size class as size-equivalent
in trees that are used to search for first best fit, so that there are
only as many "firsts" as there are size classes.  This comes closer to
the ideal of first fit.
2015-03-06 20:21:41 -08:00
Jason Evans
35e3fd9a63 Fix a compilation error and an incorrect assertion. 2015-02-18 16:51:51 -08:00
Jason Evans
99bd94fb65 Fix chunk cache races.
These regressions were introduced by
ee41ad409a (Integrate whole chunks into
unused dirty page purging machinery.).
2015-02-18 16:40:53 -08:00
Jason Evans
738e089a2e Rename "dirty chunks" to "cached chunks".
Rename "dirty chunks" to "cached chunks", in order to avoid overloading
the term "dirty".

Fix the regression caused by 339c2b23b2
(Fix chunk_unmap() to propagate dirty state.), and actually address what
that change attempted, which is to only purge chunks once, and propagate
whether zeroed pages resulted into chunk_record().
2015-02-18 01:15:50 -08:00
Jason Evans
339c2b23b2 Fix chunk_unmap() to propagate dirty state.
Fix chunk_unmap() to propagate whether a chunk is dirty, and modify
dirty chunk purging to record this information so it can be passed to
chunk_unmap().  Since the broken version of chunk_unmap() claimed that
all chunks were clean, this resulted in potential memory corruption for
purging implementations that do not zero (e.g. MADV_FREE).

This regression was introduced by
ee41ad409a (Integrate whole chunks into
unused dirty page purging machinery.).
2015-02-17 22:25:56 -08:00