Commit Graph

54 Commits

Author SHA1 Message Date
Jason Evans
0d38791e7a Edit manpage.
Make various minor edits to the manpage.
2010-10-24 12:51:38 -07:00
Jason Evans
8da141f47a Re-format size class table.
Use a more compact layout for the size class table in the man page.
This avoids layout glitches due to approaching the single-page table
size limit.
2010-10-24 11:34:50 -07:00
Jason Evans
e73397062a Replace JEMALLOC_OPTIONS with MALLOC_CONF.
Replace the single-character run-time flags with key/value pairs, which
can be set via the malloc_conf global, /etc/malloc.conf, and the
MALLOC_CONF environment variable.

Replace the JEMALLOC_PROF_PREFIX environment variable with the
"opt.prof_prefix" option.

Replace umax2s() with u2s().
2010-10-23 18:37:06 -07:00
Jason Evans
93443689a4 Add per thread allocation counters, and enhance heap sampling.
Add the "thread.allocated" and "thread.deallocated" mallctls, which can
be used to query the total number of bytes ever allocated/deallocated by
the calling thread.

Add s2u() and sa2u(), which can be used to compute the usable size that
will result from an allocation request of a particular size/alignment.

Re-factor ipalloc() to use sa2u().

Enhance the heap profiler to trigger samples based on usable size,
rather than request size.  This has a subtle, but important, impact on
the accuracy of heap sampling.  For example, previous to this change,
16- and 17-byte objects were sampled at nearly the same rate, but
17-byte objects actually consume 32 bytes each.  Therefore it was
possible for the sample to be somewhat skewed compared to actual memory
usage of the allocated objects.
2010-10-20 17:39:18 -07:00
Jason Evans
588a32cd84 Increase default backtrace depth from 4 to 128.
Increase the default backtrace depth, because shallow backtraces tend to
result in confusing pprof output graphs.
2010-10-02 22:38:14 -07:00
Jason Evans
a881cd2c61 Make cumulative heap profile data optional.
Add the R option to control whether cumulative heap profile data
are maintained.  Add the T option to control the size of per thread
backtrace caches, primarily because when the R option is specified,
backtraces that no longer have allocations associated with them are
discarded as soon as no thread caches refer to them.
2010-10-02 21:40:26 -07:00
Jason Evans
37dab02e52 Disable interval-based profile dumps by default.
It is common to have to specify something like JEMALLOC_OPTIONS=F31i,
because interval-based dumps are often unuseful or too expensive.
Therefore, disable interval-based dumps by default.  To get the previous
default behavior it is now necessary to specify 31I as part of the
options.
2010-09-30 17:10:17 -07:00
Jason Evans
6005f0710c Add the "arenas.purge" mallctl. 2010-09-30 16:55:08 -07:00
Jason Evans
8e3c3c61b5 Add {,r,s,d}allocm().
Add allocm(), rallocm(), sallocm(), and dallocm(), which are a
functional superset of malloc(), calloc(), posix_memalign(),
malloc_usable_size(), and free().
2010-09-17 15:46:18 -07:00
Jason Evans
4cc6a60a4f Update modification date in man page. 2010-09-11 23:40:24 -07:00
Jason Evans
7e11b389aa Move size class table to man page.
Move the table of size classes from jemalloc.c to the manual page.  When
manually formatting the manual page, it is now necessary to use:

    nroff -man -t jemalloc.3
2010-09-11 22:52:16 -07:00
Jason Evans
2dbecf1f62 Port to Mac OS X.
Add Mac OS X support, based in large part on the OS X support in
Mozilla's version of jemalloc.
2010-09-11 18:20:16 -07:00
Jason Evans
b267d0f86a Add the thread.arena mallctl.
Make it possible for each thread to manage which arena it is associated
with.

Implement the 'tests' and 'check' build targets.
2010-08-13 17:36:00 -07:00
Jason Evans
a91f210929 Import pprof from google-perftools, svn r91.
Fix divide-by-zero error in pprof.  It is possible for sample contexts
to currently have no associated objects, but the cumulative statistics
are still useful, depending on how the user invokes pprof.  Since
jemalloc intentionally does not filter such contexts, take care not to
divide by 0 when re-scaling for v2 heap sampling.

Install pprof as part of 'make install'.

Update pprof documentation.
2010-04-02 14:41:02 -07:00
Jason Evans
18ad8234b6 Don't disable leak reporting due to sampling.
Leak reporting is useful even if sampling is enabled; some leaks may not
be reported, but those reported are still genuine leaks.
2010-04-02 13:48:39 -07:00
Jason Evans
f18c982001 Add sampling activation/deactivation control.
Add the E/e options to control whether the application starts with
sampling active/inactive (secondary control to F/f).  Add the
prof.active mallctl so that the application can activate/deactivate
sampling on the fly.
2010-03-31 18:43:24 -07:00
Jason Evans
a02fc08ec9 Make interval-triggered profile dumping optional.
Make it possible to disable interval-triggered profile dumping, even if
profiling is enabled.  This is useful if the user only wants a single
dump at exit, or if the application manually triggers profile dumps.
2010-03-31 17:35:51 -07:00
Jason Evans
dafde14e08 Remove medium size classes.
Remove medium size classes, because concurrent dirty page purging is
no longer capable of purging inactive dirty pages inside active runs
(due to recent arena/bin locking changes).

Enhance tcache to support caching large objects, so that the same range
of size classes is still cached, despite the removal of medium size
class support.
2010-03-17 16:27:39 -07:00
Jason Evans
19b6a5537d Fix malloc_stats_print() man page prototype. 2010-03-14 19:52:26 -07:00
Jason Evans
86815df9dc Push locks into arena bins.
For bin-related allocation, protect data structures with bin locks
rather than arena locks.  Arena locks remain for run
allocation/deallocation and other miscellaneous operations.

Restructure statistics counters to maintain per bin
allocated/nmalloc/ndalloc, but continue to provide arena-wide statistics
via aggregation in the ctl code.
2010-03-14 17:38:09 -07:00
Jason Evans
3fa9a2fad8 Simplify tcache object caching.
Use chains of cached objects, rather than using arrays of pointers.

Since tcache_bin_t is no longer dynamically sized, convert tcache_t's
tbin to an array of structures, rather than an array of pointers.  This
implicitly removes tcache_bin_{create,destroy}(), which further
simplifies the fast path for malloc/free.

Use cacheline alignment for tcache_t allocations.

Remove runtime configuration option for number of tcache bin slots, and
replace it with a boolean option for enabling/disabling tcache.

Limit the number of tcache objects to the lesser of TCACHE_NSLOTS_MAX
and 2X the number of regions per run for the size class.

For GC-triggered flush, discard 3/4 of the objects below the low water
mark, rather than 1/2.
2010-03-13 20:38:18 -08:00
Jason Evans
2caa4715ed Modify dirty page purging algorithm.
Convert chunks_dirty from a red-black tree to a doubly linked list,
and use it to purge dirty pages from chunks in FIFO order.

Add a lock around the code that purges dirty pages via madvise(2), in
order to avoid kernel contention.  If lock acquisition fails,
indefinitely postpone purging dirty pages.

Add a lower limit of one chunk worth of dirty pages per arena for
purging, in addition to the active:dirty ratio.

When purging, purge all dirty pages from at least one chunk, but rather
than purging enough pages to drop to half the purging threshold, merely
drop to the threshold.
2010-03-04 22:49:59 -08:00
Jason Evans
698805c525 Simplify malloc_message().
Rather than passing four strings to malloc_message(), malloc_write4(),
and all the functions that use them, only pass one string.
2010-03-03 17:45:38 -08:00
Jason Evans
a40bc7afe8 Add release versioning support.
Base version string on 'git describe --long', and provide cpp
macros in jemalloc.h.

Add the version mallctl.
2010-03-02 13:01:16 -08:00
Jason Evans
22ca855e8f Allow prof.dump mallctl to specify filename. 2010-03-02 12:11:35 -08:00
Jason Evans
b9477e782b Implement sampling for heap profiling. 2010-03-01 20:15:26 -08:00
Jason Evans
65aae2cf57 Fix a man page typo. 2010-02-11 16:46:42 -08:00
Jason Evans
376b1529a3 Restructure source tree. 2010-02-11 14:45:59 -08:00
Jason Evans
fe5faa2cc5 Remove tracing (--enable-trace).
Remove all functionality related to tracing.  This functionality was
useful for understanding memory fragmentation during early algorithmic
design of jemalloc, but it had little utility for non-trivial
applications, due to the sheer volume of data written to disk.
2010-02-11 13:38:12 -08:00
Jason Evans
d34f9e7e93 Implement interval-based heap profile dumping.
Add mallctl interfaces for profiling parameters.

Fix a file descriptor leak in heap profile dumping.
2010-02-11 13:19:21 -08:00
Jason Evans
b01a6c2057 Add JEMALLOC_PROF_PREFIX support.
If JEMALLOC_PROF_PREFIX is set in the environment, use it as the
filename prefix when dumping heap profiles, rather than "jeprof".
2010-02-11 10:25:36 -08:00
Jason Evans
6109fe07a1 Implement allocation profiling and leack checking.
Add the --enable-prof and --enable-prof-libunwind configure options.

Add the B/b, F/f, I/i, L/l, and U/u JEMALLOC_OPTIONS.

Interval-based profile dump triggering is not yet implemented.

Add supporting generic code:
* Add memory barriers.
* Add prn (LCG PRNG).
* Add hash (Murmur hash function).
* Add ckh (cuckoo hash tables).
2010-02-10 10:37:57 -08:00
Jason Evans
d8f565f239 Remove tcache bin sorting during flush.
This feature caused significant performance degradation, and the
fragmentation reduction benefits were difficult to quantify.
2010-01-29 13:37:31 -08:00
Jason Evans
c66aaf1476 Statistics fixes and cleanup.
Fix a type mismatch for "arenas.nlruns" mallctl access.  This bug caused
a crash during statistics printing on 64-bit systems.

Fix the "stats.active" mallctl to include active memory in huge objects.

Report active bytes for the whole application, as well as per arena.

Remove several unused variables.
2010-01-29 11:24:19 -08:00
Jason Evans
3c2343518c Implement mallctl{nametomib,bymib}().
Replace chunk stats code that was missing locking; this fixes a race
condition that could corrupt chunk statistics.

Converting malloc_stats_print() to use mallctl*().

Add a missing semicolon in th DSS code.

Convert malloc_tcache_flush() to a mallctl.

Convert malloc_swap_enable() to a set of mallctl's.
2010-01-27 13:10:56 -08:00
Jason Evans
4201af0542 Add the --enable-swap configure option.
Add malloc_swap_enable().

Add the O/o JEMALLOC_OPTIONS flags, which control memory overcommit.

Fix mapped memory stats reporting for arenas.
2010-01-24 02:53:40 -08:00
Jason Evans
ed1bf457fb Add the w4opaque argument to numerous functions.
Add the w4opaque argument malloc_message() and malloc_stats_print(), and
propagate the change through all the internal APIs as necessary.
2010-01-19 12:11:25 -08:00
Jason Evans
b34e8684ec Add merged arena stats printing.
Add the "m" and "a" opts flags for malloc_stats_print().
2010-01-17 17:35:19 -08:00
Jason Evans
00b5c93347 Add the write4 parameter to malloc_stats_print().
Add malloc_cprintf() and malloc_vcprintf().
2010-01-17 15:49:25 -08:00
Jason Evans
b0fd5016db Add the --with-install-suffix configure option.
Fix some bugs in the Makefile's install target.
2010-01-17 01:49:20 -08:00
Jason Evans
e9db6c92ab Add the S/s JEMALLOC_OPTIONS flags to enable/disable tcache bin sorting. 2010-01-03 16:17:52 -08:00
Jason Evans
279e09d1ff Enhance the H/h MALLOC_OPTIONS flags to control the number of tcache bin slots,
rather than just enabling/disabling the tcache.

Fix an off-by-one bug in large object stats recording.
2010-01-03 16:16:10 -08:00
Jason Evans
3f3ecfb8e8 Enhance the G/g MALLOC_OPTIONS flags to control GC sweep interval, rather than
just enabling/disabling GC.
2010-01-03 14:45:26 -08:00
Jason Evans
03c2237af3 Make malloc_stats_print() a public symbol, and make it repeatedly callable.
Incrementally merge tcache stats, so that malloc_stats_print() always reports
at least most events that have occurred thus far.
2010-01-03 12:10:42 -08:00
Jason Evans
0b2368a6a2 Add the COPYING file, and consolidate copyright/licensing information. 2010-01-03 11:59:14 -08:00
Jason Evans
45c128d1a9 Base maximum dirty page count on proportion of active memory.
Add dirty page tracking for pages within active small/medium object runs.

Reduce chunks_dirty red-black tree operations via lazy updating.
2009-12-29 00:09:15 -08:00
Jason Evans
84cbbcb90a Convert thread-specific caching from magazines, and implement incremental GC.
Add the 'G'/'g' and 'H'/'h' MALLOC_OPTIONS flags.

Add the malloc_tcache_flush() function.

Disable thread-specific caching until the application goes multi-threaded.
2009-12-29 00:09:15 -08:00
Jason Evans
b2378168a4 Add support for medium size classes, [4KiB..32KiB], 2KiB apart by default.
Add the 'M' and 'm' MALLOC_OPTIONS flags, which control the maximum medium size
class.

Relax the cap on small/medium run size to arena_maxclass.

Reduce arena_run_reg_dalloc() integer division code complexity.

Increase the default chunk size from 1MiB to 4MiB.
2009-12-29 00:09:15 -08:00
Jason Evans
6d7bb5357a Remove opt_dss and opt_mmap, such that if DSS allocation is enabled, both DSS
and heap allocation are always enabled.
2009-12-29 00:09:15 -08:00
Jason Evans
3ee7a5c5b0 Remove the dynamic rebalancing code, since magazines reduce its utility. 2009-12-29 00:09:15 -08:00