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TSX: new fallback method (time-based)

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Basically, using timestamp counter.
Rewritten vm::reservation_op with the same principle.
Rewritten another transaction helper.
Add two new settings for configuring fallbacks.
Two limits are specified in nanoseconds (first and second).
Fix PUTLLC reload logic (prevent reusing garbage).
This commit is contained in:
Nekotekina 2020-10-31 01:52:24 +03:00
parent 80530e8aef
commit 86fc842c89
12 changed files with 263 additions and 79 deletions
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9
Utilities/asm.h
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@ -2,15 +2,18 @@
#include "types.h"
extern bool g_use_rtm;
extern u64 g_rtm_tx_limit1;
namespace utils
{
// Transaction helper (Max = max attempts) (result = pair of success and op result)
template <uint Max = 10, typename F, typename R = std::invoke_result_t<F>>
// Transaction helper (result = pair of success and op result, or just bool)
template <typename F, typename R = std::invoke_result_t<F>>
inline auto tx_start(F op)
{
uint status = -1;
for (uint i = 0; i < Max; i++)
for (auto stamp0 = __rdtsc(), stamp1 = stamp0; g_use_rtm && stamp1 - stamp0 <= g_rtm_tx_limit1; stamp1 = __rdtsc())
{
#ifndef _MSC_VER
__asm__ goto ("xbegin %l[retry];" ::: "memory" : retry);