ru.unix.bsd

 
 - RU.UNIX.BSD ------------------------------------------------------------------
 From : Slawa Olhovchenkov                   2:5030/500     20 Jan 2008  21:09:14
 To : All
 Subject : Вести с полей
 -------------------------------------------------------------------------------- 
 

 
 jasone      2007-12-31 00:59:16 UTC
 
   FreeBSD src repository
 
   Modified files:
     lib/libc/stdlib      malloc.c
   Log:
   Fix a bug related to sbrk() calls that could cause address space leaks.
   This is a long-standing bug, but until recent changes it was difficult
   to trigger, and even then its impact was non-catastrophic, with the
   exception of revision 1.157.
 
   Optimize chunk_alloc_mmap() to avoid the need for unmapping pages in the
   common case.  Thanks go to Kris Kennaway for a patch that inspired this
   change.
 
   Do not maintain a record of previously mmap'ed chunk address ranges.
   The original intent was to avoid the extra system call overhead in
   chunk_alloc_mmap(), which is no longer a concern.  This also allows some
   simplifications for the tree of unused DSS chunks.
 
   Introduce huge_mtx and dss_chunks_mtx to replace chunks_mtx.  There was
   no compelling reason to use the same mutex for these disjoint purposes.
 
   Avoid memset() for huge allocations when possible.
 
   Maintain two trees instead of one for tracking unused DSS address
   ranges.  This allows scalable allocation of multi-chunk huge objects in
   the DSS.  Previously, multi-chunk huge allocation requests failed if the
   DSS could not be extended.
 ... Стоп, себе думаю, а не дурак ли он?
 --- GoldED+/BSD 1.1.5
  * Origin:  (2:5030/500)
 
 

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