Commit Graph

167 Commits

Author SHA1 Message Date
Dave Watson
25f7bbcf28 Fix long spinning in rtree_node_init
rtree_node_init spinlocks the node, allocates, and then sets the node.
This is under heavy contention at the top of the tree if many threads
start to allocate at the same time.

Instead, take a per-rtree sleeping mutex to reduce spinning.  Tested
both pthreads and osx OSSpinLock, and both reduce spinning adequately

Previous benchmark time:
./ttest1 500 100
~15s

New benchmark time:
./ttest1 500 100
.57s
2016-11-02 20:30:53 -07:00
Jason Evans
b54072dfee Call _exit(2) rather than exit(3) in forked child.
_exit(2) is async-signal-safe, whereas exit(3) is not.
2016-11-02 18:05:19 -07:00
Jason Evans
977103c897 Uniformly cast mallctl[bymib]() oldp/newp arguments to (void *).
This avoids warnings in some cases, and is otherwise generally good
hygiene.
2016-10-27 21:31:25 -07:00
Jason Evans
44df4a45cf Explicitly cast negative constants meant for use as unsigned. 2016-10-27 21:29:59 -07:00
Jason Evans
17aa187f6b Add cast to silence (harmless) conversion warning. 2016-10-27 21:29:00 -07:00
Jason Evans
b54d160dc4 Do not (recursively) allocate within tsd_fetch().
Refactor tsd so that tsdn_fetch() does not trigger allocation, since
allocation could cause infinite recursion.

This resolves #458.
2016-10-20 23:59:12 -07:00
Jason Evans
577d4572b0 Make dss operations lockless.
Rather than protecting dss operations with a mutex, use atomic
operations.  This has negligible impact on synchronization overhead
during typical dss allocation, but is a substantial improvement for
extent_in_dss() and the newly added extent_dss_mergeable(), which can be
called multiple times during extent deallocations.

This change also has the advantage of avoiding tsd in deallocation paths
associated with purging, which resolves potential deadlocks during
thread exit due to attempted tsd resurrection.

This resolves #425.
2016-10-13 15:37:00 -07:00
Jason Evans
9acd5cf178 Remove all vestiges of chunks.
Remove mallctls:
- opt.lg_chunk
- stats.cactive

This resolves #464.
2016-10-12 11:55:43 -07:00
Jason Evans
63b5657aa5 Remove ratio-based purging.
Make decay-based purging the default (and only) mode.

Remove associated mallctls:
- opt.purge
- opt.lg_dirty_mult
- arena.<i>.lg_dirty_mult
- arenas.lg_dirty_mult
- stats.arenas.<i>.lg_dirty_mult

This resolves #385.
2016-10-12 10:40:27 -07:00
Jason Evans
48993ed536 Fix decay tests to all adapt to nstime_monotonic(). 2016-10-11 15:28:43 -07:00
Jason Evans
5f11fb7d43 Do not advance decay epoch when time goes backwards.
Instead, move the epoch backward in time.  Additionally, add
nstime_monotonic() and use it in debug builds to assert that time only
goes backward if nstime_update() is using a non-monotonic time source.
2016-10-10 22:15:10 -07:00
Elliot Ronaghan
fbd7956d45 Work around a weird pgi bug in test/unit/math.c
pgi fails to compile math.c, reporting that `-INFINITY` in `pt_norm_expected[]`
is a "Non-constant" expression. A simplified version of this failure is:

```c
#include <math.h>

static double inf1, inf2 = INFINITY;  // no complaints
static double inf3 = INFINITY;        // suddenly INFINITY is "Non-constant"

int main() { }
```

```sh
PGC-S-0074-Non-constant expression in initializer (t.c: 4)
```

pgi errors on the declaration of inf3, and will compile fine if that line is
removed. I've reported this bug to pgi, but in the meantime I just switched to
using (DBL_MAX + DBL_MAX) to work around this bug.
2016-06-08 14:20:32 -07:00
Jason Evans
04942c3d90 Remove a stray memset(), and fix a junk filling test regression. 2016-06-05 21:00:02 -07:00
Jason Evans
6f29a83924 Add rtree lookup path caching.
rtree-based extent lookups remain more expensive than chunk-based run
lookups, but with this optimization the fast path slowdown is ~3 CPU
cycles per metadata lookup (on Intel Core i7-4980HQ), versus ~11 cycles
prior.  The path caching speedup tends to degrade gracefully unless
allocated memory is spread far apart (as is the case when using a
mixture of sbrk() and mmap()).
2016-06-05 20:59:57 -07:00
Jason Evans
c8c3cbdf47 Miscellaneous s/chunk/extent/ updates. 2016-06-05 20:42:24 -07:00
Jason Evans
0c4932eb1e s/chunk_lookup/extent_lookup/g, s/chunks_rtree/extents_rtree/g 2016-06-05 20:42:23 -07:00
Jason Evans
7d63fed0fd Rename huge to large. 2016-06-05 20:42:23 -07:00
Jason Evans
498856f44a Move slabs out of chunks. 2016-06-05 20:42:23 -07:00
Jason Evans
ed2c2427a7 Use huge size class infrastructure for large size classes. 2016-06-05 20:42:18 -07:00
Jason Evans
b46261d58b Implement cache-oblivious support for huge size classes. 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
25845db7c9 Dodge ivsalloc() assertion in test code. 2016-06-03 12:27:41 -07:00
Jason Evans
e75e9be130 Add rtree element witnesses. 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
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
7bb00ae9d6 Refactor runs_avail.
Use pszind_t size classes rather than szind_t size classes, and always
reserve space for NPSIZES elements.  This removes unused heaps that are
not multiples of the page size, and adds (currently) unused heaps for
all huge size classes, with the immediate benefit that the size of
arena_t allocations is constant (no longer dependent on chunk size).
2016-05-16 12:21:21 -07:00
Jason Evans
226c446979 Implement pz2ind(), pind2sz(), and psz2u().
These compute size classes and indices similarly to size2index(),
index2size() and s2u(), respectively, but using the subset of size
classes that are multiples of the page size.  Note that pszind_t and
szind_t are not interchangeable.
2016-05-13 10:31:54 -07:00
Jason Evans
627372b459 Initialize arena_bin_info at compile time rather than at boot time.
This resolves #370.
2016-05-13 10:31:30 -07:00
Jason Evans
b683734b43 Implement BITMAP_INFO_INITIALIZER(nbits).
This allows static initialization of bitmap_info_t structures.
2016-05-13 10:27:48 -07:00
Jason Evans
17c021c177 Remove redzone support.
This resolves #369.
2016-05-13 10:27:33 -07:00
Jason Evans
ba5c709517 Remove quarantine support. 2016-05-13 10:25:05 -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
0c12dcabc5 Fix tsd bootstrapping for a0malloc(). 2016-05-07 16:55:36 -07:00
Jason Evans
1eb46ab6e7 Don't test fork() on Windows. 2016-05-03 17:18:34 -07:00
Jason Evans
108c4a11e9 Fix witness/fork() interactions.
Fix witness to clear its list of owned mutexes in the child if
platform-specific malloc_mutex code re-initializes mutexes rather than
unlocking them.
2016-04-26 10:47:22 -07:00
Jason Evans
174c0c3a9c Fix fork()-related lock rank ordering reversals. 2016-04-25 23:16:20 -07:00
Jason Evans
2fe64d237c Fix arena_reset() test to avoid tcache. 2016-04-25 12:51:17 -07:00
Jason Evans
19ff2cefba Implement the arena.<i>.reset mallctl.
This makes it possible to discard all of an arena's allocations in a
single operation.

This resolves #146.
2016-04-22 15:20:06 -07:00
Jason Evans
1423ee9016 Fix style nits. 2016-04-17 13:44:59 -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
bab58ef401 Fix more 64-to-32 conversion warnings. 2016-04-12 12:39:02 -07:00
Jason Evans
96aa67aca8 Clean up char vs. uint8_t in junk filling code.
Consistently use uint8_t rather than char for junk filling code.
2016-04-11 02:26:35 -07:00
Jason Evans
c6a2c39404 Refactor/fix ph.
Refactor ph to support configurable comparison functions.  Use a cpp
macro code generation form equivalent to the rb macros so that pairing
heaps can be used for both run heaps and chunk heaps.

Remove per node parent pointers, and instead use leftmost siblings' prev
pointers to track parents.

Fix multi-pass sibling merging to iterate over intermediate results
using a FIFO, rather than a LIFO.  Use this fixed sibling merging
implementation for both merge phases of the auxiliary twopass algorithm
(first merging the aux list, then replacing the root with its merged
children).  This fixes both degenerate merge behavior and the potential
for deep recursion.

This regression was introduced by
6bafa6678f (Pairing heap).

This resolves #371.
2016-04-11 02:15:42 -07:00
Jason Evans
a3c4193280 Fix a compilation warning in the ph test code. 2016-04-05 16:32:59 -07:00
Chris Peterson
a82070ef5f Add JEMALLOC_ALLOC_JUNK and JEMALLOC_FREE_JUNK macros
Replace hardcoded 0xa5 and 0x5a junk values with JEMALLOC_ALLOC_JUNK and
JEMALLOC_FREE_JUNK macros, respectively.
2016-03-31 11:23:29 -07:00
Jason Evans
22af74e106 Refactor out signed/unsigned comparisons. 2016-03-15 09:40:02 -07:00
Dave Watson
34dca5671f Unittest for pairing heap 2016-03-08 13:48:27 -08:00
Dmitri Smirnov
33184bf698 Fix stack corruption and uninitialized var warning
Stack corruption happens in x64 bit

This resolves #347.
2016-02-29 15:22:53 -08:00