This fixes an incorrect debug-mode assert:
- T1 starts an arena stats update and reads stack_head from another thread's
cache bin, when that cache bin has 1 item in it.
- T2 allocates from that cache bin. The cache_bin's stack_head now points to a
NULL pointer, since the cache bin is empty.
- T1 Re-reads the cache_bin's stack_head to perform an assertion check (since it
previously saw that the bin was empty, whatever stack_head points to should be
non-NULL).
This hints to the compiler that it should care more about space than CPU (among
other things). In cases where the compiler lacks profile-guided information,
this can be a substantial space savings.
For now, we mark the mallctl or atexit driven profiling and stats functions that
take up the most space.
pthread_key_create on QNX triggers recursive allocation during tsd
bootstrapping. Using tsd_init_check_recursion to detect that.
Before pthread_key_create, the address of tsd_boot_wrapper is returned
from tsd_get_wrapper instead of using TLS to store the pointer.
tsd_set_wrapper becomes a no-op. After that, the address of
tsd_boot_wrapper is written to TLS and bootstrap continues as before.
Signed-off-by: Jin Qian <jqian@aurora.tech>
Now that we have flat bitmap bit counting functions, we can easily assert that
nfree is always correct. While we're tightening up this code, enforce
consistency on API boundaries as well.
This is no longer part of the "core" functionality; we only need the stub
implementations as an end-to-end test of hpdata + psset interactions when
metadata is being modified. Treat them accordingly.
Using an edata_t both for hugepages and the allocations within those hugepages
was convenient at first, but has outlived its usefulness. Representing
hugepages explicitly, with their own data structure, will make future
development easier.
This was promised in the review of the introduction of geom_grow, but would have
been painful to do there because of the series that introduced it. Now that
those are comitted, renaming is easier.
At least one libc (musl) defines pthread_setname_np without defining
pthread_getname_np. Detect the presence of each individually, rather than
inferring both must be defined if set is.
In previous designs, this was intended to be a sort of cache that couldn't fail.
In the current design, we want to use it just as a contention reduction
mechanism. Rewrite it with those goals in mind.
This (experimental, undocumented) functionality can be used by users to track
various statistics of interest at a finer level of granularity than the thread.
Previously all the small size classes were cached. However this has downsides
-- particularly when page size is greater than 4K (e.g. iOS), which will result
in much higher SMALL_MAXCLASS.
This change allows tcache_max to be set to lower values, to better control
resources taken by tcache.
This functions more like the serial number strategy of the ecache and
hpa_central_t. Longer-lived slabs are more likely to continue to live for
longer in the future.
