Commit Graph

3357 Commits

Author SHA1 Message Date
Kevin Svetlitski
4e6f1e9208 Allow overriding LG_PAGE
This is useful for our internal builds where we override the
configuration in the header files generated by autoconf.
2023-05-17 13:55:38 -07:00
Kevin Svetlitski
3e2ba7a651 Remove dead stores detected by static analysis
None of these are harmful, and they are almost certainly optimized
away by the compiler. The motivation for fixing them anyway is that
we'd like to enable static analysis as part of CI, and the first step
towards that is resolving the warnings it produces at present.
2023-05-11 20:27:49 -07:00
Kevin Svetlitski
0288126d9c Fix possible NULL pointer dereference from mallctl("prof.prefix", ...)
Static analysis flagged this issue. Here is a minimal program which
causes a segfault within Jemalloc:
```
#include <jemalloc/jemalloc.h>

const char *malloc_conf = "prof:true";

int main() {
  mallctl("prof.prefix", NULL, NULL, NULL, 0);
}
```

Fixed by checking if `prefix` is `NULL`.
2023-05-11 14:47:50 -07:00
Qi Wang
d4a2b8bab1 Add the prof_sys_thread_name feature in the prof_recent unit test.
This tests the combination of the prof_recent and thread_name features.
Verified that it catches the issue being fixed in this PR.

Also explicitly set thread name in test/unit/prof_recent.  This fixes the name
testing when no default thread name is set (e.g. FreeBSD).
2023-05-11 09:10:57 -07:00
Qi Wang
94ace05832 Fix the prof thread_name reference in prof_recent dump.
As pointed out in #2434, the thread_name in prof_tdata_t was changed in #2407.
This also requires an update for the prof_recent dump, specifically the emitter
expects a "char **" which is fixed in this commit.
2023-05-11 09:10:57 -07:00
Qi Wang
6ea8a7e928 Add config detection for JEMALLOC_HAVE_PTHREAD_SET_NAME_NP.
and use it on the background thread name setting.
2023-05-11 09:10:57 -07:00
auxten
5bac384970 If ptr present check if alloc_ctx.edata == NULL 2023-05-10 17:18:22 -07:00
auxten
019cccc293 Make arenas_lookup_ctl triable 2023-05-10 17:18:22 -07:00
Kevin Svetlitski
dc0a184f8d Fix possible NULL pointer dereference in VERIFY_READ
Static analysis flagged this. Fixed by simply checking `oldlenp`
before dereferencing it.
2023-05-09 10:57:09 -07:00
Kevin Svetlitski
12311fe6c3 Fix segfault in extent_try_coalesce_impl
Static analysis flagged this. `extent_record` was passing `NULL` as the
value for `coalesced` to `extent_try_coalesce`, which in turn passes
that argument to `extent_try_coalesce_impl`, where it is written to
without checking if it is `NULL`. I can confirm from reviewing the
fleetwide coredump data that this was in fact being hit in production.
2023-05-09 10:55:44 -07:00
Kevin Svetlitski
70344a2d38 Make eligible functions static
The codebase is already very disciplined in making any function which
can be `static`, but there are a few that appear to have slipped through
the cracks.
2023-05-08 15:00:02 -07:00
Kevin Svetlitski
6841110bd6 Make edata_cmp_summary_comp 30% faster
`edata_cmp_summary_comp` is one of the very hottest functions, taking up
3% of all time spent inside Jemalloc. I noticed that all existing
callsites rely only on the sign of the value returned by this function,
so I came up with this equivalent branchless implementation which
preserves this property. After empirical measurement, I have found that
this implementation is 30% faster, therefore representing a 1% speed-up
to the allocator as a whole.

At @interwq's suggestion, I've applied the same optimization to
`edata_esnead_comp` in case this function becomes hotter in the future.
2023-05-04 09:59:17 -07:00
Amaury Séchet
f2b28906e6 Some nits in cache_bin.h 2023-05-01 10:21:17 -07:00
Kevin Svetlitski
fc680128e0 Remove errant assert in arena_extent_alloc_large
This codepath may generate deferred work when the HPA is enabled.
See also [@davidtgoldblatt's relevant comment on the PR which
introduced this](https://github.com/jemalloc/jemalloc/pull/2107#discussion_r699770967)
which prevented a similarly incorrect `assert` from being added elsewhere.
2023-05-01 10:00:30 -07:00
Eric Mueller
521970fb2e Check for equality instead of assigning in asserts in hpa_from_pai.
It appears like a simple typo means we're unconditionally overwriting
some fields in hpa_from_pai when asserts are enabled. From hpa_shard_init,
it looks like these fields have these values anyway, so this shouldn't
cause bugs, but if something is wrong it seems better to have these
asserts in place.

See issue #2412.
2023-04-17 20:57:48 -07:00
guangli-dai
5f64ad60cd Remove locked flag set in malloc_mutex_trylock
As a hint flag of the lock, parameter locked should be set only
when the lock is gained or freed.
2023-04-06 10:57:04 -07:00
Qi Wang
434a68e221 Disallow decay during reentrancy.
Decay should not be triggered during reentrant calls (may cause lock order
reversal / deadlocks).  Added a delay_trigger flag to the tickers to bypass
decay when rentrancy_level is not zero.
2023-04-05 10:16:37 -07:00
Qi Wang
e62aa478c7 Rearrange the bools in prof_tdata_t to save some bytes.
This lowered the sizeof(prof_tdata_t) from 200 to 192 which is a round size
class.  Afterwards the tdata_t size remain unchanged with the last commit, which
effectively inlined the storage of thread names for free.
2023-04-05 10:03:12 -07:00
Qi Wang
ce0b7ab6c8 Inline the storage for thread name in prof_tdata_t.
The previous approach managed the thread name in a separate buffer, which causes
races because the thread name update (triggered by new samples) can happen at
the same time as prof dumping (which reads the thread names) -- these two
operations are under separate locks to avoid blocking each other.  Implemented
the thread name storage as part of the tdata struct, which resolves the lifetime
issue and also avoids internal alloc / dalloc during prof_sample.
2023-04-05 10:03:12 -07:00
Qi Wang
6cab460a45 Add a multithreaded test for prof_sys_thread_name.
Verified that this catches the issue being fixed in 5fd5583.
2023-04-05 10:03:12 -07:00
Amaury Séchet
5266152d79 Simplify the logic in ph_remove 2023-03-31 14:35:31 -07:00
Amaury Séchet
be6da4f663 Do not maintain root->prev in ph_remove. 2023-03-31 14:34:57 -07:00
Amaury Séchet
543e2d61e6 Simplify the logic in ph_insert
Also fixes what looks like an off by one error in the lazy aux list
merge part of the code that previously never touched the last node in
the aux list.
2023-03-31 14:34:24 -07:00
guangli-dai
31e01a98f1 Fix the rdtscp detection bug and add prefix for the macro. 2023-03-23 11:16:19 -07:00
Qi Wang
8b64be3441 Explicit arena assignment in test_tcache_max.
Otherwise the associated arena could change with percpu arena enabled.
2023-03-22 15:16:43 -07:00
Qi Wang
8e7353a19b Explicit arena assignment in test_thread_idle.
Otherwise the associated arena could change with percpu arena enabled.
2023-03-22 15:16:43 -07:00
Marvin Schmidt
45249cf5a9 Fix exception specification error for hosts using musl libc
It turns out that the previous commit did not suffice since the
JEMALLOC_SYS_NOTHROW definition also causes the same exception specification
errors as JEMALLOC_USE_CXX_THROW did:
```
x86_64-pc-linux-musl-cc -std=gnu11 -Werror=unknown-warning-option -Wall -Wextra -Wshorten-64-to-32 -Wsign-compare -Wundef -Wno-format-zero-length -Wpointer-
arith -Wno-missing-braces -Wno-missing-field-initializers -pipe -g3 -fvisibility=hidden -Wimplicit-fallthrough -O3 -funroll-loops -march=native -O2 -pipe -c -march=native -O2 -pipe -D_GNU_SOURCE -D_REENTRANT -Iinclude -Iinclude -o src/background_thread.o src/background_thread.c
In file included from src/jemalloc_cpp.cpp:9:
In file included from include/jemalloc/internal/jemalloc_preamble.h:27:
include/jemalloc/internal/../jemalloc.h:254:32: error: exception specification in declaration does not match previous declaration
    void JEMALLOC_SYS_NOTHROW   *je_malloc(size_t size)
                                 ^
include/jemalloc/internal/../jemalloc.h:75:21: note: expanded from macro 'je_malloc'
                    ^
/usr/x86_64-pc-linux-musl/include/stdlib.h:40:7: note: previous declaration is here
void *malloc (size_t);
      ^
```

On systems using the musl C library we have to omit the exception specification
on malloc function family like it's done for MacOS, FreeBSD and OpenBSD.
2023-03-16 12:11:40 -07:00
Marvin Schmidt
aba1645f2d configure: Handle *-linux-musl* hosts properly
This is the same as the `*-*-linux*` case with the two exceptions that
we don't set glibc=1 and don't define JEMALLOC_USE_CXX_THROW
2023-03-16 12:11:40 -07:00
Qi Wang
d503d72129 Add the missing descriptions in AC_DEFINE 2023-03-14 16:47:00 -07:00
Qi Wang
71bc1a3d91 Avoid assuming the arena id in test when percpu_arena is used. 2023-03-13 10:50:10 -07:00
Amaury Séchet
f743690739 Remove unused mutex from hpa_central 2023-03-10 11:25:47 -08:00
Chris Seymour
4edea8eb8e switch to https 2023-03-09 11:44:02 -08:00
guangli-dai
09e4b38fb1 Use asm volatile during benchmarks. 2023-02-24 11:17:48 -08:00
Fernando Pelliccioni
e8b28908de [MSVC] support for Visual Studio 2019 and 2022 2023-02-21 13:39:25 -08:00
barracuda156
4422f88d17 Makefile.in: link with g++ when cxx enabled 2023-02-21 13:26:58 -08:00
Qi Wang
c7805f1eb5 Add a header in HPA stats for the nonfull slabs. 2023-02-17 13:31:27 -08:00
Qi Wang
b6125120ac Add an explicit name to the dedicated oversize arena. 2023-02-17 13:31:09 -08:00
Qi Wang
97b313c7d4 More conservative setting for /test/unit/background_thread_enable.
Lower the thread and arena count to avoid resource exhaustion on 32-bit.
2023-02-16 14:42:21 -08:00
Qi Wang
5fd55837bb Fix thread_name updating for heap profiling.
The current thread name reading path updates the name every time, which requires
both alloc and dalloc -- and the temporary NULL value in the middle causes races
where the prof dump read path gets NULLed in the middle.

Minimize the changes in this commit to isolate the bugfix testing; will also
refactor the whole thread name paths later.
2023-02-15 17:49:40 -08:00
Qi Wang
8580c65f81 Implement prof sample hooks "experimental.hooks.prof_sample(_free)".
The added hooks hooks.prof_sample and hooks.prof_sample_free are intended to
allow advanced users to track additional information, to enable new ways of
profiling on top of the jemalloc heap profile and sample features.

The sample hook is invoked after the allocation and backtracing, and forwards
the both the allocation and backtrace to the user hook; the sample_free hook
happens before the actual deallocation, and forwards only the ptr and usz to the
hook.
2022-12-07 16:06:49 -08:00
guangli-dai
a74acb57e8 Fix dividing 0 error in stress/cpp/microbench
Summary:
Per issue #2356, some CXX compilers may optimize away the
new/delete operation in stress/cpp/microbench.cpp.
Thus, this commit (1) bumps the time interval to 1 if it is 0, and
(2) modifies the pointers in the microbench to volatile.
2022-12-06 10:46:14 -08:00
Guangli Dai
e8f9f13811 Inline free and sdallocx into operator delete 2022-11-21 11:14:05 -08:00
guangli-dai
06374d2a6a Benchmark operator delete
Added the microbenchmark for operator delete.
Also modified bench.h so that it can be used in C++.
2022-11-21 11:14:05 -08:00
guangli-dai
14ad8205bf Update the ratio display in benchmark
In bench.h, specify the ratio as the time consumption ratio and
modify the display of the ratio.
2022-11-21 11:14:05 -08:00
Qi Wang
481bbfc990 Add a configure option --enable-force-getenv.
Allows the use of getenv() rather than secure_getenv() to read MALLOC_CONF.
This helps in situations where hosts are under full control, and setting
MALLOC_CONF is needed while also setuid.  Disabled by default.
2022-11-04 13:37:14 -07:00
Qi Wang
143e9c4a2f Enable fast thread locals for dealloc-only threads.
Previously if a thread does only allocations, it stays on the slow path /
minimal initialized state forever.  However, dealloc-only is a valid pattern for
dedicated reclamation threads -- this means thread cache is disabled (no batched
flush) for them, which causes high overhead and contention.

Added the condition to fully initialize TSD when a fair amount of dealloc
activities are observed.
2022-10-25 09:54:38 -07:00
Paul Smith
be65438f20 jemalloc_internal_types.h: Use alloca if __STDC_NO_VLA__ is defined
No currently-available version of Visual Studio C compiler supports
variable length arrays, even if it defines __STDC_VERSION__ >= C99.
As far as I know Microsoft has no plans to ever support VLAs in MSVC.

The C11 standard requires that the __STDC_NO_VLA__ macro be defined if
the compiler doesn't support VLAs, so fall back to alloca() if so.
2022-10-14 15:48:32 -07:00
divanorama
1897f185d2 Fix safety_check segfault in double free test 2022-10-03 10:55:10 -07:00
Jordan Rome
b04e7666f2 update PROFILING_INTERNALS.md
Expand the bad example of summing before unbiasing.
2022-10-03 10:48:29 -07:00
David Carlier
4c95c953e2 fix build for non linux/BSD platforms. 2022-10-03 10:42:09 -07:00