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libitm: Add missing undo-logging of RfW src regions in gl_wt memtransfer.

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libitm/
	* method-gl.cc (gl_wt_dispatch::memtransfer_static): Add missing undo
	for RfW src.  Optimize number of calls to gtm_thr.

From-SVN: r184399
This commit is contained in:
Torvald Riegel 2012-02-20 20:56:42 +00:00 committed by Torvald Riegel
parent 95d65553de
commit 33a03827d2
2 changed files with 16 additions and 8 deletions
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5
libitm/ChangeLog
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@ -1,3 +1,8 @@
2012-02-20 Torvald Riegel <triegel@redhat.com>
* method-gl.cc (gl_wt_dispatch::memtransfer_static): Add missing undo
for RfW src. Optimize number of calls to gtm_thr.
2012-02-20 Torvald Riegel <triegel@redhat.com>
* beginend.cc (GTM::gtm_thread::begin_transaction): Move serial lock

19
libitm/method-gl.cc
View File

@ -85,9 +85,9 @@ static gl_mg o_gl_mg;
class gl_wt_dispatch : public abi_dispatch
{
protected:
static void pre_write(const void *addr, size_t len)
static void pre_write(const void *addr, size_t len,
gtm_thread *tx = gtm_thr())
{
gtm_thread *tx = gtm_thr();
gtm_word v = tx->shared_state.load(memory_order_relaxed);
if (unlikely(!gl_mg::is_locked(v)))
{
@ -123,7 +123,7 @@ protected:
tx->undolog.log(addr, len);
}
static void validate()
static void validate(gtm_thread *tx = gtm_thr())
{
// Check that snapshot is consistent. We expect the previous data load to
// have acquire memory order, or be atomic and followed by an acquire
@ -137,7 +137,6 @@ protected:
// or read an orec value that was written after the data had been written.
// Either will allow us to detect inconsistent reads because it will have
// a higher/different value.
gtm_thread *tx = gtm_thr();
gtm_word l = o_gl_mg.orec.load(memory_order_relaxed);
if (l != tx->shared_state.load(memory_order_relaxed))
tx->restart(RESTART_VALIDATE_READ);
@ -198,9 +197,13 @@ public:
static void memtransfer_static(void *dst, const void* src, size_t size,
bool may_overlap, ls_modifier dst_mod, ls_modifier src_mod)
{
if ((dst_mod != WaW && src_mod != RaW)
&& (dst_mod != NONTXNAL || src_mod == RfW))
pre_write(dst, size);
gtm_thread *tx = gtm_thr();
if (dst_mod != WaW && dst_mod != NONTXNAL)
pre_write(dst, size, tx);
// We need at least undo-logging for an RfW src region because we might
// subsequently write there with WaW.
if (src_mod == RfW)
pre_write(src, size, tx);
// FIXME We should use atomics here (see store()). Let's just hope that
// memcpy/memmove are good enough.
@ -211,7 +214,7 @@ public:
if (src_mod != RfW && src_mod != RaW && src_mod != NONTXNAL
&& dst_mod != WaW)
validate();
validate(tx);
}
static void memset_static(void *dst, int c, size_t size, ls_modifier mod)