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libitm: Put gl_wt global lock on separate cache line.

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libitm/
	* method-gl.cc (gl_wt_dispatch::orec): Put on separate cacheline.

From-SVN: r184403
This commit is contained in:
Torvald Riegel 2012-02-20 20:57:37 +00:00 committed by Torvald Riegel
parent 4c9bd6acb0
commit 63b08143d6
2 changed files with 6 additions and 2 deletions
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4
libitm/ChangeLog
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@ -1,3 +1,7 @@
2012-02-20 Torvald Riegel <triegel@redhat.com>
* method-gl.cc (gl_wt_dispatch::orec): Put on separate cacheline.
2012-02-20 Torvald Riegel <triegel@redhat.com>
* method-gl.cc (gl_wt_dispatch::rollback): Optimize memory orders.

4
libitm/method-gl.cc
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@ -41,7 +41,8 @@ struct gl_mg : public method_group
static gtm_word clear_locked(gtm_word l) { return l & ~LOCK_BIT; }
// The global ownership record.
atomic<gtm_word> orec;
// No tail-padding necessary (the virtual functions aren't used frequently).
atomic<gtm_word> orec __attribute__((aligned(HW_CACHELINE_SIZE)));
virtual void init()
{
@ -52,7 +53,6 @@ struct gl_mg : public method_group
virtual void fini() { }
};
// TODO cacheline padding
static gl_mg o_gl_mg;