Commit Graph

81 Commits

Author SHA1 Message Date
Yinan Zhang
2256ef8961 Add option to fetch system thread name on each prof sample 2020-03-24 21:39:57 -07:00
Yinan Zhang
21dfa4300d Change assert_* to expect_* in tests
```
grep -Irl assert_ test/ | xargs sed -i \
    's/witness_assert/witness_do_not_replace/g';
grep -Irl assert_ test/ | xargs sed -i \
    's/malloc_mutex_assert_owner/malloc_mutex_do_not_replace_owner/g';

grep -Ir assert_ test/ | grep -o "[_a-zA-Z]*assert_[_a-zA-Z]*" | \
    grep -v "^assert_"; # confirm no output
grep -Irl assert_ test/ | xargs sed -i 's/assert_/expect_/g';

grep -Irl witness_do_not_replace test/ | xargs sed -i \
    's/witness_do_not_replace/witness_assert/g';
grep -Irl malloc_mutex_do_not_replace_owner test/ | xargs sed -i \
    's/malloc_mutex_do_not_replace_owner/malloc_mutex_assert_owner/g';
```
2020-02-19 16:03:16 -08:00
Qi Wang
88b0e03a4e Implement opt.stats_interval and the _opts options.
Add options stats_interval and stats_interval_opts to allow interval based stats
printing.  This provides an easy way to collect stats without code changes,
because opt.stats_print may not work (some binaries never exit).
2020-01-29 09:57:55 -08:00
David Goldblatt
6a622867ca Add "thread.idle" mallctl.
This can encapsulate various internal cleaning logic, and can be used to free up
resources before a long sleep.
2020-01-22 18:29:13 -08:00
Yinan Zhang
9a60cf54ec Last-N profiling mode 2019-12-30 15:58:57 -08:00
Yinan Zhang
a8b578d538 Remove mallctl test for zero_realloc 2019-11-05 10:09:18 -08:00
David T. Goldblatt
9cfa805947 Realloc: Make behavior of realloc(ptr, 0) configurable. 2019-10-29 17:48:44 -07:00
Yinan Zhang
beb7c16e94 Guard prof_active reset by opt_prof
Set `prof_active` to read-only when `opt_prof` is turned off.
2019-10-02 11:42:53 -07:00
Yinan Zhang
c92ac30601 Add confirm_conf option
If the confirm_conf option is set, when the program starts, each of
the four malloc_conf strings will be printed, and each option will
be printed when being set.
2019-05-22 09:38:39 -07:00
Yinan Zhang
7ee3897740 Separate tests for extent utilization API
As title.
2019-04-10 13:03:20 -07:00
Yinan Zhang
9aab3f2be0 Add memory utilization analytics to mallctl
The analytics tool is put under experimental.utilization namespace in
mallctl.  Input is one pointer or an array of pointers and the output
is a list of memory utilization statistics.
2019-04-04 13:48:39 -07:00
Qi Wang
e3db480f6f Rename huge_threshold to oversize_threshold.
The keyword huge tend to remind people of huge pages which is not relevent to
the feature.
2019-01-25 13:15:45 -08:00
Qi Wang
7a815c1b7c Un-experimental the huge_threshold feature. 2019-01-16 12:28:57 -08:00
Qi Wang
45bb4483ba Add stats for arenas.bin.i.nshards. 2018-12-03 17:17:03 -08:00
David Goldblatt
3aba072cef SC: Remove global data.
The global data is mostly only used at initialization, or for easy access to
values we could compute statically.  Instead of consuming that space (and
risking TLB misses), we can just pass around a pointer to stack data during
bootstrapping.
2018-07-23 13:37:08 -07:00
David Goldblatt
55e5cc1341 SC: Make some key size classes static.
The largest small class, smallest large class, and largest large class may all
be needed down fast paths; to avoid the risk of touching another cache line, we
can make them available as constants.
2018-07-12 20:53:06 -07:00
David Goldblatt
e904f813b4 Hide size class computation behind a layer of indirection.
This class removes almost all the dependencies on size_classes.h, accessing the
data there only via the new module sc.h, which does not depend on any
configuration options.

In a subsequent commit, we'll remove the configure-time size class computations,
doing them at boot time, instead.
2018-07-12 20:53:06 -07:00
Qi Wang
cdf15b458a Rename huge_threshold to experimental, and tweak documentation. 2018-06-29 10:35:02 -07:00
Qi Wang
1302af4c43 Add ctl and stats for opt.huge_threshold. 2018-06-29 10:35:02 -07:00
Qi Wang
94a88c26f4 Implement huge arena: opt.huge_threshold.
The feature allows using a dedicated arena for huge allocations.  We want the
addtional arena to separate huge allocation because: 1) mixing small extents
with huge ones causes fragmentation over the long run (this feature reduces VM
size significantly); 2) with many arenas, huge extents rarely get reused across
threads; and 3) huge allocations happen way less frequently, therefore no
concerns for lock contention.
2018-06-29 10:35:02 -07:00
David Goldblatt
59e371f463 Hooks: Add a hook exhaustion test.
When we run out of space in which to store hooks, we should return EAGAIN from
the mallctl, but not otherwise misbehave.
2018-05-18 11:43:03 -07:00
David Goldblatt
bb071db92e Mallctl: Add experimental.hooks.[install|remove]. 2018-05-18 11:43:03 -07:00
Latchesar Ionkov
a32b7bd567 Mallctl: Add arenas.lookup
Implement a new mallctl operation that allows looking up the arena a
region of memory belongs to.
2018-05-01 13:14:36 -07:00
Qi Wang
cf2f4aac1c Fix const qualifier warnings. 2018-04-09 16:50:30 -07:00
Qi Wang
e4f090e8df Add opt.thp which allows explicit hugepage usage.
"always" marks all user mappings as MADV_HUGEPAGE; while "never" marks all
mappings as MADV_NOHUGEPAGE. The default setting "default" does not change any
settings.  Note that all the madvise calls are part of the default extent hooks
by design, so that customized extent hooks have complete control over the
mappings including hugepage settings.
2018-03-08 13:08:06 -08:00
David T. Goldblatt
4bf4a1c4ea Pull out arena_bin_info_t and arena_bin_t into their own file.
In the process, kill arena_bin_index, which is unused.  To follow are several
diffs continuing this separation.
2017-12-18 16:29:10 -08:00
Qi Wang
fac706836f Add opt.lg_extent_max_active_fit
When allocating from dirty extents (which we always prefer if available), large
active extents can get split even if the new allocation is much smaller, in
which case the introduced fragmentation causes high long term damage.  This new
option controls the threshold to reuse and split an existing active extent.  We
avoid using a large extent for much smaller sizes, in order to reduce
fragmentation.  In some workload, adding the threshold improves virtual memory
usage by >10x.
2017-11-16 15:32:02 -08:00
Qi Wang
e422fa8e7e Add arena.i.retain_grow_limit
This option controls the max size when grow_retained.  This is useful when we
have customized extent hooks reserving physical memory (e.g. 1G huge pages).
Without this feature, the default increasing sequence could result in fragmented
and wasted physical memory.
2017-11-03 13:53:33 -07:00
Qi Wang
47b20bb654 Change opt.metadata_thp to [disabled,auto,always].
To avoid the high RSS caused by THP + low usage arena (i.e. THP becomes a
significant percentage), added a new "auto" option which will only start using
THP after a base allocator used up the first THP region.  Starting from the
second hugepage (in a single arena), "auto" behaves the same as "always",
i.e. madvise hugepage right away.
2017-08-30 16:47:32 -07:00
Qi Wang
b0825351d9 Add missing mallctl unit test for abort_conf.
The abort_conf option was missed from test/unit/mallctl.
2017-08-11 22:58:58 -07:00
Qi Wang
8fdd9a5797 Implement opt.metadata_thp
This option enables transparent huge page for base allocators (require
MADV_HUGEPAGE support).
2017-08-11 14:51:20 -07:00
Jason Evans
b511232fcd Refactor/fix background_thread/percpu_arena bootstrapping.
Refactor bootstrapping such that dlsym() is called during the
bootstrapping phase that can tolerate reentrant allocation.
2017-06-01 08:55:27 -07:00
Jason Evans
596b479d83 Skip default tcache testing if !opt_tcache. 2017-06-01 08:55:27 -07:00
Qi Wang
2c368284d2 Add tests for background threads. 2017-05-23 12:26:20 -07:00
Jason Evans
6e62c62862 Refactor *decay_time into *decay_ms.
Support millisecond resolution for decay times.  Among other use cases
this makes it possible to specify a short initial dirty-->muzzy decay
phase, followed by a longer muzzy-->clean decay phase.

This resolves #812.
2017-05-18 11:33:45 -07:00
Jason Evans
b9ab04a191 Refactor !opt.munmap to opt.retain. 2017-04-29 09:24:12 -07:00
Jason Evans
c67c3e4a63 Replace --disable-munmap with opt.munmap.
Control use of munmap(2) via a run-time option rather than a
compile-time option (with the same per platform default).  The old
behavior of --disable-munmap can be achieved with
--with-malloc-conf=munmap:false.

This partially resolves #580.
2017-04-24 20:37:16 -07:00
Jason Evans
b2a8453a3f Remove --disable-tls.
This option is no longer useful, because TLS is correctly configured
automatically on all supported platforms.

This partially resolves #580.
2017-04-21 11:12:29 -07:00
Jason Evans
4403c9ab44 Remove --disable-tcache.
Simplify configuration by removing the --disable-tcache option, but
replace the testing for that configuration with
--with-malloc-conf=tcache:false.

Fix the thread.arena and thread.tcache.flush mallctls to work correctly
if tcache is disabled.

This partially resolves #580.
2017-04-21 10:06:12 -07:00
David Goldblatt
f692e6c214 Header refactoring: move util.h out of the catchall 2017-04-18 18:35:03 -07:00
Jason Evans
64e458f5cd Implement two-phase decay-based purging.
Split decay-based purging into two phases, the first of which uses lazy
purging to convert dirty pages to "muzzy", and the second of which uses
forced purging, decommit, or unmapping to convert pages to clean or
destroy them altogether.  Not all operating systems support lazy
purging, yet the application may provide extent hooks that implement
lazy purging, so care must be taken to dynamically omit the first phase
when necessary.

The mallctl interfaces change as follows:
- opt.decay_time --> opt.{dirty,muzzy}_decay_time
- arena.<i>.decay_time --> arena.<i>.{dirty,muzzy}_decay_time
- arenas.decay_time --> arenas.{dirty,muzzy}_decay_time
- stats.arenas.<i>.pdirty --> stats.arenas.<i>.p{dirty,muzzy}
- stats.arenas.<i>.{npurge,nmadvise,purged} -->
  stats.arenas.<i>.{dirty,muzzy}_{npurge,nmadvise,purged}

This resolves #521.
2017-03-15 13:13:47 -07:00
Qi Wang
ec532e2c5c Implement per-CPU arena.
The new feature, opt.percpu_arena, determines thread-arena association
dynamically based CPU id. Three modes are supported: "percpu", "phycpu"
and disabled.

"percpu" uses the current core id (with help from sched_getcpu())
directly as the arena index, while "phycpu" will assign threads on the
same physical CPU to the same arena. In other words, "percpu" means # of
arenas == # of CPUs, while "phycpu" has # of arenas == 1/2 * (# of
CPUs). Note that no runtime check on whether hyper threading is enabled
is added yet.

When enabled, threads will be migrated between arenas when a CPU change
is detected. In the current design, to reduce overhead from reading CPU
id, each arena tracks the thread accessed most recently. When a new
thread comes in, we will read CPU id and update arena if necessary.
2017-03-08 23:19:01 -08:00
Jason Evans
c0cc5db871 Replace tabs following #define with spaces.
This resolves #564.
2017-01-20 21:45:53 -08:00
Jason Evans
f408643a4c Remove extraneous parens around return arguments.
This resolves #540.
2017-01-20 21:43:07 -08:00
Jason Evans
c4c2592c83 Update brace style.
Add braces around single-line blocks, and remove line breaks before
function-opening braces.

This resolves #537.
2017-01-20 21:43:07 -08:00
Jason Evans
ffbb7dac3d Remove leading blank lines from function bodies.
This resolves #535.
2017-01-13 14:49:24 -08:00
Jason Evans
edf1bafb2b Implement arena.<i>.destroy .
Add MALLCTL_ARENAS_DESTROYED for accessing destroyed arena stats as an
analogue to MALLCTL_ARENAS_ALL.

This resolves #382.
2017-01-06 18:58:46 -08:00
Jason Evans
dc2125cf95 Replace the arenas.initialized mallctl with arena.<i>.initialized . 2017-01-06 18:58:46 -08:00
Jason Evans
0f04bb1d6f Rename the arenas.extend mallctl to arenas.create. 2017-01-06 18:58:45 -08:00
Jason Evans
3dc4e83ccb Add MALLCTL_ARENAS_ALL.
Add the MALLCTL_ARENAS_ALL cpp macro as a fixed index for use
in accessing the arena.<i>.{purge,decay,dss} and stats.arenas.<i>.*
mallctls, and deprecate access via the arenas.narenas index (to be
removed in 6.0.0).
2017-01-06 18:58:45 -08:00