jasone 2008-03-07 22:39:39 UTC
FreeBSD src repository
Modified files: (Branch: RELENG_7)
lib/libc/gen Symbol.map
lib/libc/stdlib malloc.3 malloc.c
lib/libkse kse.map
lib/libkse/sys lock.c lock.h
lib/libkse/thread thr_cond.c thr_init.c thr_kern.c
thr_mutex.c thr_rtld.c
lib/libthr pthread.map
lib/libthr/thread thr_mutex.c
Log:
MFC: Merge malloc(3) improvements and fixes. The highlights are:
* Avoid re-zeroing memory in calloc() when possible.
* Use pthread mutexes where possible instead of libc "spinlocks", and
actually spin some during contention before blocking.
* Implement dynamic load balancing of thread-->arena mapping.
* Avoid floating point math in order to avoid increased context switch
overhead for applications that otherwise would not use floating point
math.
* Restructure how sbrk() and mmap() are used to acquire memory mappings.
This provides a way to force malloc to only use sbrk(), which can be
useful in the context of resource limits.
* Reduce the number of mmap() calls typically necessary when allocating
a chunk.
* Track dirty unused pages so that they can be purged if they exceed a
threshold.
* Try to realloc() large objects in place.
* Manage page runs with trees instead of chunk maps, which allows
logarithmic-time run allocation.
Revision Changes Path
1.6.2.1 +1 -0 src/lib/libc/gen/Symbol.map
1.73.2.1 +95 -36 src/lib/libc/stdlib/malloc.3
1.147.2.2 +2283 -1341 src/lib/libc/stdlib/malloc.c
1.1.2.1 +1 -0 src/lib/libkse/kse.map
1.11.2.2 +4 -3 src/lib/libkse/sys/lock.c
1.8.2.1 +1 -1 src/lib/libkse/sys/lock.h
1.57.2.1 +1 -1 src/lib/libkse/thread/thr_cond.c
1.76.2.1 +4 -4 src/lib/libkse/thread/thr_init.c
1.125.2.2 +5 -5 src/lib/libkse/thread/thr_kern.c
1.53.2.2 +30 -7 src/lib/libkse/thread/thr_mutex.c
1.7.2.1 +1 -1 src/lib/libkse/thread/thr_rtld.c
1.18.2.1 +1 -0 src/lib/libthr/pthread.map
1.54.2.3 +23 -6 src/lib/libthr/thread/thr_mutex.c