Commit Graph

14 Commits

Author SHA1 Message Date
Qi Wang
20b8c70e9f Added extents_dirty / _muzzy mutexes, as well as decay_dirty / _muzzy. 2017-03-23 00:03:28 -07:00
Qi Wang
64c5f5c174 Added "stats.mutexes.reset" mallctl to reset all mutex stats.
Also switched from the term "lock" to "mutex".
2017-03-23 00:03:28 -07:00
Qi Wang
0fb5c0e853 Add arena lock stats output. 2017-03-23 00:03:28 -07:00
Qi Wang
a4f176af57 Output bin lock profiling results to malloc_stats.
Two counters are included for the small bins: lock contention rate, and
max lock waiting time.
2017-03-23 00:03:28 -07:00
Jason Evans
64e458f5cd Implement two-phase decay-based purging.
Split decay-based purging into two phases, the first of which uses lazy
purging to convert dirty pages to "muzzy", and the second of which uses
forced purging, decommit, or unmapping to convert pages to clean or
destroy them altogether.  Not all operating systems support lazy
purging, yet the application may provide extent hooks that implement
lazy purging, so care must be taken to dynamically omit the first phase
when necessary.

The mallctl interfaces change as follows:
- opt.decay_time --> opt.{dirty,muzzy}_decay_time
- arena.<i>.decay_time --> arena.<i>.{dirty,muzzy}_decay_time
- arenas.decay_time --> arenas.{dirty,muzzy}_decay_time
- stats.arenas.<i>.pdirty --> stats.arenas.<i>.p{dirty,muzzy}
- stats.arenas.<i>.{npurge,nmadvise,purged} -->
  stats.arenas.<i>.{dirty,muzzy}_{npurge,nmadvise,purged}

This resolves #521.
2017-03-15 13:13:47 -07:00
David Goldblatt
ee202efc79 Convert remaining arena_stats_t fields to atomics
These were all size_ts, so we have atomics support for them on all platforms, so
the conversion is straightforward.

Left non-atomic is curlextents, which AFAICT is not used atomically anywhere.
2017-03-13 18:22:33 -07:00
David Goldblatt
4fc2acf5ae Switch atomic uint64_ts in arena_stats_t to C11 atomics
I expect this to be the trickiest conversion we will see, since we want atomics
on 64-bit platforms, but are also always able to piggyback on some sort of
external synchronization on non-64 bit platforms.
2017-03-13 18:22:33 -07:00
Jason Evans
04d8fcb745 Optimize malloc_large_stats_t maintenance.
Convert the nrequests field to be partially derived, and the curlextents
to be fully derived, in order to reduce the number of stats updates
needed during common operations.

This change affects ndalloc stats during arena reset, because it is no
longer possible to cancel out ndalloc effects (curlextents would become
negative).
2017-03-04 08:18:31 -08:00
Jason Evans
472fef2e12 Fix {allocated,nmalloc,ndalloc,nrequests}_large stats regression.
This fixes a regression introduced by
d433471f58 (Derive
{allocated,nmalloc,ndalloc,nrequests}_large stats.).
2017-02-27 11:18:07 -08:00
Jason Evans
d433471f58 Derive {allocated,nmalloc,ndalloc,nrequests}_large stats.
This mildly reduces stats update overhead during normal operation.
2017-02-16 09:39:46 -08:00
Jason Evans
6b5cba4191 Convert arena->stats synchronization to atomics. 2017-02-16 09:39:46 -08:00
Jason Evans
d27f29b468 Disentangle arena and extent locking.
Refactor arena and extent locking protocols such that arena and
extent locks are never held when calling into the extent_*_wrapper()
API.  This requires extra care during purging since the arena lock no
longer protects the inner purging logic.  It also requires extra care to
protect extents from being merged with adjacent extents.

Convert extent_t's 'active' flag to an enumerated 'state', so that
retained extents are explicitly marked as such, rather than depending on
ring linkage state.

Refactor the extent collections (and their synchronization) for cached
and retained extents into extents_t.  Incorporate LRU functionality to
support purging.  Incorporate page count accounting, which replaces
arena->ndirty and arena->stats.retained.

Assert that no core locks are held when entering any internal
[de]allocation functions.  This is in addition to existing assertions
that no locks are held when entering external [de]allocation functions.

Audit and document synchronization protocols for all arena_t fields.

This fixes a potential deadlock due to recursive allocation during
gdump, in a similar fashion to b49c649bc1
(Fix lock order reversal during gdump.), but with a necessarily much
broader code impact.
2017-02-01 16:43:46 -08:00
Qi Wang
58424e679d Added stats about number of bytes cached in tcache currently. 2017-01-18 10:55:21 -08:00
David Goldblatt
77cccac8cd Break up headers into constituent parts
This is part of a broader change to make header files better represent the
dependencies between one another (see
https://github.com/jemalloc/jemalloc/issues/533). It breaks up component headers
into smaller parts that can be made to have a simpler dependency graph.

For the autogenerated headers (smoothstep.h and size_classes.h), no splitting
was necessary, so I didn't add support to emit multiple headers.
2017-01-12 15:43:51 -08:00