The recent pairing heap optimizations flattened the lock hold time profile.
This was a win for raw cycle counts, but ended up causing us to "just miss"
acquiring the mutex before sleeping more often. Bump those counts.
By force-inlining everything that would otherwise be a macro, we get the same
effect (it's not clear in the first place that this is actually a good idea, but
it avoids making any changes to the existing performance profile).
This makes the code more maintainable (in anticipation of subsequent changes),
as well as making performance profiles and debug info more readable (we get
"real" line numbers, instead of making everything point to the macro definition
of all associated functions).
The edata_cache_small had a fill/flush heuristic. In retrospect, this was a
premature optimization; more testing indicates that an unbounded cache is
effectively fine here, and moreover we spend a nontrivial amount of time doing
unnecessary filling/flushing.
As the HPA takes on a larger and larger fraction of all allocations, any
theoretical differences in allocation patterns should shrink. The HPA is more
efficient with its metadata in general, so it still comes out ahead on metadata
usage anyways.
We wait a while after deciding a huge extent should get hugified to see if it
gets purged before long. This avoids hugifying extents that might shortly get
dehugified for purging.
Rename and use the hpa_dehugification_threshold option support code for this,
since it's now ignored.
On OS X, "gcc" is really just clang anyways, so this combination gets tested by
the gcc test. This is purely redundant, and (since it runs early in the output)
increases time to signal for real breakages further down in the list.
This fixes two simple but significant typos in the HPA:
- The conf string parsing accidentally set a min value of PAGE for
hpa_sec_batch_fill_extra; i.e. allocating 4096 extra pages every time we
attempted to allocate a single page. This puts us over the SEC flush limit,
so we then immediately flush all but one of them (probably triggering
purging).
- The HPA was using the default PAI batch alloc implementation, which meant it
did not actually get any locking advantages.
This snuck by because I did all the performance testing without using the PAI
interface or config settings. When I cleaned it up and put everything behind
nice interfaces, I only did correctness checks, and didn't try any performance
ones.
This is a simple multi-producer, single-consumer queue. The intended use case
is in the HPA, as we begin supporting hpdatas that move between hpa_shards. We
take just a single CAS as the cost to send a message (or a batch of messages) in
the low-contention case, and lock-freedom lets us avoid some lock-ordering
issues.
Hold the ecache lock across extent_recycle_extract() and extent_recycle_split(),
so that the extent_deactivate after split can avoid re-take the ecache mutex.
Now that all merging go through try_acquire_edata_neighbor, the mergeablility
checks (including head state checking) are done before reaching the merge hook.
In other words, merge hook will never be called if the head state doesn't agree.
Instead of passing down the new_addr, pass down the active edata which allows us
to always use a neighbor-acquiring semantic. In other words, this tells us both
the original edata and neighbor address. With this change, only neighbors of a
"known" edata can be acquired, i.e. acquiring an edata based on an arbitrary
address isn't possible anymore.
