issue-443: Increase the number of objects transferred between thread cache and central free list

This fix is a result of a performance degradation observed in multi-threaded programs where large
amounts of memory (30GB) are consumed, released by a pool of threads in a cyclic manner. This was
mainly due to the amount of time we were spending in the slow path consolidating memory between
the thread cache and central free list. The default has been bumped up to 32768 and is now also
controllable through the TCMALLOC_TRANSFER_NUM_OBJ environment setting.


git-svn-id: http://gperftools.googlecode.com/svn/trunk@193 6b5cf1ce-ec42-a296-1ba9-69fdba395a50
issue-490: Added support for acquire/release atomic exchange

The atomic ops API was missing support for all of the various
flavors of Acquire_AtomicExchange and Release_AtomicExchange
which have now been added.


git-svn-id: http://gperftools.googlecode.com/svn/trunk@194 6b5cf1ce-ec42-a296-1ba9-69fdba395a50
issue-491: Significant performance improvement for spin lock contention

This patch fixes issues where spinlocks under contention were failing to
wakeup waiters, sometimes resulting in blow ups from 13ns to as high as 256ms.
Under heavy contention, applications were observed sleeping for minutes at a
time giving the appearance of a hang.  


git-svn-id: http://gperftools.googlecode.com/svn/trunk@195 6b5cf1ce-ec42-a296-1ba9-69fdba395a50
issue-496: Fixes an issue where tcmalloc might deadlock in a thread calling fork

tcmalloc contained a bug where some internal locks were left in a undefined state
between fork, leaving the child process in a deadlock state. This patch fixes the
issue by introducing stricter locking between the parent nd child while forking.


git-svn-id: http://gperftools.googlecode.com/svn/trunk@196 6b5cf1ce-ec42-a296-1ba9-69fdba395a50
issue-493: Fix for building against ARM targets

gperftools was failing to build for arm targets for the following reasons:
1. Some ARMv7 instructions used when the target is ARMv6 so those fail to assemble
2. The cache line length is undefined for ARM architectures


git-svn-id: http://gperftools.googlecode.com/svn/trunk@197 6b5cf1ce-ec42-a296-1ba9-69fdba395a50
issue-425: Fixed tcmalloc unittest crashes for windows builds

Missing use of volatile was causing vs2010 to perform unwanted
optimization resulting in the crash. See issue for more details.


git-svn-id: http://gperftools.googlecode.com/svn/trunk@198 6b5cf1ce-ec42-a296-1ba9-69fdba395a50
issue-503: recover original INSTALL file

That was accidently overwritten by autotools files update in r196
issue-503: removed checked in configure and other auto* products

People wishing to build gperftools from svn checkout should run
autogen.sh first which will create those files and then ./configure &&
make as usual

INSTALL file has updated instructions too.