cvs commit: src/lib/libc/gen Symbol.map src/lib/libc/stdlib malloc.3 malloc.c src/lib/libkse kse.map src/lib/libkse/sys lock.c lock.h src/lib/libkse/thread thr_cond.c thr_init.c thr_kern.c thr_mutex.c thr_rtld.c src/lib/libthr pthread.map ...

Jason Evans jasone at FreeBSD.org
Fri Mar 7 22:39:40 UTC 2008


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


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