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2021-06-03merge revision(s) ↵nagachika
86c262541ad07528842d76dab4b9b34bd888d5f4,7e14762159643b4415e094f9d2a90afaf7994588: [Backport #17935] Fix a race condition around mjit_recompile This fixes SEGVs like https://github.com/ruby/ruby/runs/2715166621?check_suite_focus=true. When mjit_recompile is called when mjit_compile is compiling the exact same iseq (and after it called mjit_capture_cc_entries), iseq->body->jit_unit is re-created and its cc_entries becomes NULL. Then, when it tries to lookup cc_entries through iseq->body->jit_unit, it fails. --- mjit.c | 21 +++++++++++++-------- mjit_worker.c | 4 ++++ 2 files changed, 17 insertions(+), 8 deletions(-) Do not doubly hold an MJIT lock This is a follow-up of 86c262541ad07528842d76dab4b9b34bd888d5f4. CRITICAL_SECTION_START/FINISH are not needed when it's called from an MJIT worker. Also, ZALLOC needs to be calloc because ZALLOC may trigger GC, which an MJIT worker must not do. --- mjit.c | 23 ++++++++++++++--------- mjit_worker.c | 4 ++-- 2 files changed, 16 insertions(+), 11 deletions(-)
2021-06-03merge revision(s) 1aac0e88193a82ed36b43e852c46414181b66455: [Backport #17928]nagachika
Mark inlined ISeqs during MJIT compilation (#4539) [Bug #17584] --- common.mk | 6 ++++++ mjit.c | 18 +++++++++++----- mjit_compile.c | 24 +++++++++++++++------ mjit_worker.c | 66 ++++++++++++++++++++++++++++++++++++++++++++++++++++++---- 4 files changed, 99 insertions(+), 15 deletions(-)
2021-01-13enable constant cache on ractorsKoichi Sasada
constant cache `IC` is accessed by non-atomic manner and there are thread-safety issues, so Ruby 3.0 disables to use const cache on non-main ractors. This patch enables it by introducing `imemo_constcache` and allocates it by every re-fill of const cache like `imemo_callcache`. [Bug #17510] Now `IC` only has one entry `IC::entry` and it points to `iseq_inline_constant_cache_entry`, managed by T_IMEMO object. `IC` is atomic data structure so `rb_mjit_before_vm_ic_update()` and `rb_mjit_after_vm_ic_update()` is not needed.
2020-12-20Mark an ISeq being JIT-edTakashi Kokubun
This is to avoid SEGV on a CC reference in a normal compilation https://github.com/ruby/ruby/runs/1586578023
2020-12-20Mark active_unitsTakashi Kokubun
to avoid SEGV on mjit_recompile and compact_all_jit_code. For some reason, ISeqs on stack are sometimes GC-ed (why?) and therefore it may run mjit_recompile on a GC-ed ISeq, which I expected d07183ec85d to fix but apparently it may refer to random things if already GC-ed. Marking active_units would workaround the situation. http://ci.rvm.jp/results/trunk-mjit-wait@phosphorus-docker/3292740 Also, while compact_all_jit_code was executed, we saw some SEGVs where CCs seemed to be already GC-ed, meaning their owner ISeq was not marked properly. Even if units are still in active_units, it's not guaranteed that their ISeqs are in use. So in this case we need to mark active_units for a legitimate reason. http://ci.rvm.jp/results/trunk-mjit-wait@phosphorus-docker/3293277 http://ci.rvm.jp/results/trunk-mjit-wait@phosphorus-docker/3293090
2020-12-20Stop marking unit_queueTakashi Kokubun
The original motivation of this marking was https://github.com/k0kubun/yarv-mjit/issues/20. As wanabe said, there are multiple options to mitigate the issue, and Eric Wong introduced another fix at 143776f6fe by checking unit->iseq inside the lock. Therefore this particular condition has been covered in two ways, and the script given by wanabe no longer crashes without mjit_mark().
2020-12-16Do not access jit_unit if NULLTakashi Kokubun
2020-12-16Inline getconstant on JIT (#3906)Takashi Kokubun
* Inline getconstant on JIT * Support USE_MJIT=0 Notes: Merged-By: k0kubun <takashikkbn@gmail.com>
2020-12-16Lazily move units from active_units to stale_unitsTakashi Kokubun
to avoid SEGV like http://ci.rvm.jp/results/trunk-mjit@phosphorus-docker/3289588 by a race condition between mjit_recompile and compation around active_units
2020-12-03Assert unit->iseq null out happens under the JIT/GC guardTakashi Kokubun
2020-11-27Throttle unload_unitsTakashi Kokubun
Because d80226e7bd often reduces the number of unloaded units, it increases the number of unload_units calls, which are heavy. To mitigate that, this throttles unload_units per `max_cache_size / 10`. Also hoping to fix https://ci.appveyor.com/project/ruby/ruby/builds/36552382/job/kjmjgw9cjyf2ksd7
2020-11-27Run unload_units in the JIT worker threadTakashi Kokubun
to avoid "Too many JIT code, but skipped unloading units for JIT compaction". Now we can forget the `in_compact` locking. Moving some functions from mjit.c to mjit_worker.c because mjit_worker.c should have functions executed in the JIT worker.
2020-11-24Handle calloc failureTakashi Kokubun
for cfd8c7e6ca9f923cee3a062b548d0824fc67e9a5.
2020-11-23Prefer calloc/free over ZALLOC/xfreeTakashi Kokubun
To avoid SEGV like http://ci.rvm.jp/logfiles/brlog.trunk-mjit.20201124-061530
2020-11-22ruby/internal/config.h needs to be included firstTakashi Kokubun
to define USE_MJIT.
2020-11-22Make --disable-jit-support compileTakashi Kokubun
vm_core.h needs to be included to know rb_execution_context_t, etc. I also added a trivial refactoring in mjit.c and missing dependency for process.c.
2020-11-22Remove obsoleted internal/mjit.h inclusionTakashi Kokubun
:bow:
2020-11-22Stop leaving .c files for JIT compaction in /tmp (#3802)Takashi Kokubun
* Re-generate C files for JIT compaction every time * Refactor in_jit return logic * Just write code in a single file * Add a TODO comment [ci skip] Notes: Merged-By: k0kubun <takashikkbn@gmail.com>
2020-11-21Make sure all threads are scanned on unload_unitsTakashi Kokubun
This has been a TODO since 79df14c04b. While adcf0316d1 covered the root_fiber of the initial thread, it didn't cover root_fibers of other threads. Now it's hooked properly in rb_threadptr_root_fiber_setup. With regards to "XXX: Is this mjit_cont `mjit_cont_free`d?", when rb_threadptr_root_fiber_release is called, although I'm not sure when th->root_fiber is truthy, fiber_free seems to call cont_free and mjit_cont_free. So mjit_conts of root_fibers seem to be freed properly.
2020-11-20Fix wrong #ifdef usages with #ifTakashi Kokubun
Apparently #ifdef is always true
2020-11-20Unify some confusing macro usagesTakashi Kokubun
_MSC_VER used to be the macro to switch JIT compaction. However, since d4381d2ceb, the correct macro to switch it was changed from _MSC_VER to _WIN32. As I didn't properly replace all relevant _MSC_VER usages to _WIN32, these macros have been used inconsistently. nobu replaced _WIN32 with USE_HEADER_TRANSFORMATION in 5eb446d12f3. Therefore we had USE_HEADER_TRANSFORMATION and _MSC_VER. This commit makes sure such inconsistent _MSC_VER usages will be unified to the new header, also renaming it to USE_JIT_COMPACTION to be more precise about the requirements. The header transformation itself is not quite relevant to places changed in this commit.
2020-11-20Eliminate IVC sync between JIT and Ruby threads (#3799)Takashi Kokubun
Thanks to Ractor (https://github.com/ruby/ruby/pull/2888 and https://github.com/ruby/ruby/pull/3662), inline caches support parallel access now. Notes: Merged-By: k0kubun <takashikkbn@gmail.com>
2020-10-22Assert in_gc >= 0 instead of guarding it (#3687)Takashi Kokubun
Notes: Merged-By: k0kubun <takashikkbn@gmail.com>
2020-10-22Use a lock level for a less granular lock.Aaron Patterson
We are seeing an error where code that is generated with MJIT contains references to objects that have been moved. I believe this is due to a race condition in the compaction function. `gc_compact` has two steps: 1. Run a full GC to pin objects 2. Compact / update references Step one is executed with `garbage_collect`. `garbage_collect` calls `gc_enter` / `gc_exit`, these functions acquire a JIT lock and release a JIT lock. So a lock is held for the duration of step 1. Step two is executed by `gc_compact_after_gc`. It also holds a JIT lock. I believe the problem is that the JIT is free to execute between step 1 and step 2. It copies call cache values, but doesn't pin them when it copies them. So the compactor thinks it's OK to move the call cache even though it is not safe. We need to hold a lock for the duration of `garbage_collect` *and* `gc_compact_after_gc`. This patch introduces a lock level which increments and decrements. The compaction function can increment and decrement the lock level and prevent MJIT from executing during both steps. Notes: Merged: https://github.com/ruby/ruby/pull/3683
2020-09-03Introduce Ractor mechanism for parallel executionKoichi Sasada
This commit introduces Ractor mechanism to run Ruby program in parallel. See doc/ractor.md for more details about Ractor. See ticket [Feature #17100] to see the implementation details and discussions. [Feature #17100] This commit does not complete the implementation. You can find many bugs on using Ractor. Also the specification will be changed so that this feature is experimental. You will see a warning when you make the first Ractor with `Ractor.new`. I hope this feature can help programmers from thread-safety issues. Notes: Merged: https://github.com/ruby/ruby/pull/3365
2020-06-09mjit_mark_cc_entries: should consider VM_CALLCACHE_UNMARKABLE卜部昌平
Now that vm_empty_cc is VM_CALLCACHE_UNMARKABLE, it has to be properly ruled out from being GCed.
2020-05-26Eliminate a call instruction on JIT cancel pathTakashi Kokubun
by calling combined functions specialized for each cancel type. I'm hoping to improve locality of hot code, but this patch's impact should be insignificant.
2020-05-11sed -i 's|ruby/impl|ruby/internal|'卜部昌平
To fix build failures. Notes: Merged: https://github.com/ruby/ruby/pull/3079
2020-05-11sed -i s|ruby/3|ruby/impl|g卜部昌平
This shall fix compile errors. Notes: Merged: https://github.com/ruby/ruby/pull/3079
2020-05-01Deduplicate functions in compacted JIT codeTakashi Kokubun
to improve code locality. Using benchmark-driver/sinatra with 100 methods JIT-ed, [Before] 12149.97 rps 1.3M /tmp/_ruby_mjit_p31171u145.so [After] 12818.83 rps 260K /tmp/_ruby_mjit_p32155u145.so (VM is 13714.89 rps)
2020-04-30Do not stop the world during JIT compactionTakashi Kokubun
Running C compiler for JIT compaction inside a critical section may lock main thread for a long time when it triggers GC. As I'm planning to increase this duration a bit, I'd like to make sure this doesn't stop the world. For now, I chose to give up unloading units when it's during JIT compaction, assuming other calls may unload them later.
2020-04-12Add MJIT_COUNTER macro to dump total_callsTakashi Kokubun
2020-04-08Merge pull request #2991 from shyouhei/ruby.h卜部昌平
Split ruby.h Notes: Merged-By: shyouhei <shyouhei@ruby-lang.org>
2020-03-15Add debug counter for unload_unitsTakashi Kokubun
changing add_iseq_to_process's debug counter name as well for comparison
2020-03-12Mark all cc_entries associated to compiled_iseqTakashi Kokubun
2020-03-12Move code to mark jit_unit's cc_entries to mjit.cTakashi Kokubun
2020-03-10Capture inlined iseq's cc entries in root iseq'sTakashi Kokubun
jit_unit to avoid marking wrong cc entries when inlined iseq is compiled multiple times, resolving the TODO added by daf7c48d88. This obviates pseudo jit_unit in inlined iseq introduced by 7ec2359374 and fixes memory leak of the adhoc unit.
2020-02-28Prevent unloading methods used in root_fiber while calling another Fiber (#2939)Takashi Kokubun
Fixing SEGVs like: http://ci.rvm.jp/results/trunk-mjit-wait@silicon-docker/2744905 http://ci.rvm.jp/results/trunk-mjit-wait@silicon-docker/2744420 http://ci.rvm.jp/results/trunk-mjit-wait@silicon-docker/2741400 Notes: Merged-By: k0kubun <takashikkbn@gmail.com>
2020-02-28Avoid infinite loop on --jit-waitTakashi Kokubun
2020-02-26Internalize rb_mjit_unit definition againTakashi Kokubun
Fixed a TODO in b9007b6c548f91e88fd3f2ffa23de740431fa969
2020-02-25Remove an unused declarationTakashi Kokubun
It was unnecessary in b9007b6c548f91e88fd3f2ffa23de740431fa969
2020-02-25should be initialize jit_unit->cc_entries.Koichi Sasada
GC can invoke just after allocation of jit_unit->cc_entries so it should be zero-cleared.
2020-02-25prevent GC from mjit worker.Koichi Sasada
ALLOC_N() can causes GC. Sometimes `mjit_copy_job_handler()` can be called by mjit_worker thread which is not a Ruby thread, so we need to prevent GC in this function. This patch has some issues, but I introduce it to pass the tests.
2020-02-22Introduce disposable call-cache.Koichi Sasada
This patch contains several ideas: (1) Disposable inline method cache (IMC) for race-free inline method cache * Making call-cache (CC) as a RVALUE (GC target object) and allocate new CC on cache miss. * This technique allows race-free access from parallel processing elements like RCU. (2) Introduce per-Class method cache (pCMC) * Instead of fixed-size global method cache (GMC), pCMC allows flexible cache size. * Caching CCs reduces CC allocation and allow sharing CC's fast-path between same call-info (CI) call-sites. (3) Invalidate an inline method cache by invalidating corresponding method entries (MEs) * Instead of using class serials, we set "invalidated" flag for method entry itself to represent cache invalidation. * Compare with using class serials, the impact of method modification (add/overwrite/delete) is small. * Updating class serials invalidate all method caches of the class and sub-classes. * Proposed approach only invalidate the method cache of only one ME. See [Feature #16614] for more details. Notes: Merged: https://github.com/ruby/ruby/pull/2888
2020-02-22VALUE size packed callinfo (ci).Koichi Sasada
Now, rb_call_info contains how to call the method with tuple of (mid, orig_argc, flags, kwarg). Most of cases, kwarg == NULL and mid+argc+flags only requires 64bits. So this patch packed rb_call_info to VALUE (1 word) on such cases. If we can not represent it in VALUE, then use imemo_callinfo which contains conventional callinfo (rb_callinfo, renamed from rb_call_info). iseq->body->ci_kw_size is removed because all of callinfo is VALUE size (packed ci or a pointer to imemo_callinfo). To access ci information, we need to use these functions: vm_ci_mid(ci), _flag(ci), _argc(ci), _kwarg(ci). struct rb_call_info_kw_arg is renamed to rb_callinfo_kwarg. rb_funcallv_with_cc() and rb_method_basic_definition_p_with_cc() is temporary removed because cd->ci should be marked. Notes: Merged: https://github.com/ruby/ruby/pull/2888
2020-02-06function pointers are not void*卜部昌平
The same as 8427fca49bd85205f5a8766292dd893f003c0e48. Notes: Merged: https://github.com/ruby/ruby/pull/2885
2019-12-26decouple internal.h headers卜部昌平
Saves comitters' daily life by avoid #include-ing everything from internal.h to make each file do so instead. This would significantly speed up incremental builds. We take the following inclusion order in this changeset: 1. "ruby/config.h", where _GNU_SOURCE is defined (must be the very first thing among everything). 2. RUBY_EXTCONF_H if any. 3. Standard C headers, sorted alphabetically. 4. Other system headers, maybe guarded by #ifdef 5. Everything else, sorted alphabetically. Exceptions are those win32-related headers, which tend not be self- containing (headers have inclusion order dependencies). Notes: Merged: https://github.com/ruby/ruby/pull/2711
2019-12-03mjit.c: fix a mismatch of malloc'ed typeYusuke Endoh
Coverity Scan found this issue.
2019-12-01Simplify variable declaration by C99Takashi Kokubun
2019-12-01Constified mjit_initNobuyoshi Nakada
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-11 12:27:59 +0000