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by only allocating one FixedDeletion with the new "all" flag
instead of one FixedDeletion per slot.
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Separate pseudo-deleted-flag from the hash value.
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by using a cooperative strategy that will make
any process accessing the table execute delelete_all_objects_continue
until the table is empty.
This is not an optimal solution as concurrent threads will still
block on the table lock, but at least thread progress is made.
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This refactor was done using the unifdef tool like this:
for file in $(find erts/ -name *.[ch]); do unifdef -t -f defile -o $file $file; done
where defile contained:
#define ERTS_SMP 1
#define USE_THREADS 1
#define DDLL_SMP 1
#define ERTS_HAVE_SMP_EMU 1
#define SMP 1
#define ERL_BITS_REENTRANT 1
#define ERTS_USE_ASYNC_READY_Q 1
#define FDBLOCK 1
#undef ERTS_POLL_NEED_ASYNC_INTERRUPT_SUPPORT
#define ERTS_POLL_ASYNC_INTERRUPT_SUPPORT 0
#define ERTS_POLL_USE_WAKEUP_PIPE 1
#define ERTS_POLL_USE_UPDATE_REQUESTS_QUEUE 1
#undef ERTS_HAVE_PLAIN_EMU
#undef ERTS_SIGNAL_STATE
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The implementation is still hidden behind ERTS_ENABLE_LOCK_COUNT, and
all categories are still enabled by default, but the actual counting can be
toggled at will.
OTP-13170
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from process psd through all owned/fixed tables.
As meta_pid_to{_fixed}_tab maps to slot in meta_main_tab
which is planned for destruction.
In this commit we no longer seize table lock while
freeing the table (free_table_cont) as it's not needed
and makes the code a bit simpler. Any concurrent operation
on the table will only access lock, owner and status
and then bail out.
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by simply asking for the size of struct ext_segtab
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due to the grow/shrink hysteresis of the meta tables
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* Keep it simple(r)
* To prepare for both dynamic sized segments and segtabs
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in tables without write_concurrency
and remove it totally #ifndef ERTS_SMP
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This reverts commit f4bdac18cb9dd45185e911308a5ebd95ff10d7fd.
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in tables without write_concurrency
and remove it totally #ifndef ERTS_SMP
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OTP-12376
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Effects if sizeof(erts_smp_rwmtx_t) > 64:
+ Better performance due to less false sharing
- Increased memory footprint per table
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Make it possible to change the number of write_concurrency locks to use. This
is usefull to change when you for some reason want to use more/less locks
per write_concurrency ets table. eg. OSs with a limit on how many mutexes
can exist at once.
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Add an extra pointer to start of segment with the active segment table
to get rid of PossiblyLost errors without the need of a too general
suppression that may hide real memory leaks in ETS.
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