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Use 64-bit integers inside Stopwatch to enable longer timings.

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This commit is contained in:
Andreas Kling 2019-03-21 13:36:40 +01:00
parent 0114c61cf1
commit 9dfcd95cd7
5 changed files with 155 additions and 25 deletions
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24
Kernel/i386.h
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@ -269,27 +269,29 @@ inline void read_tsc(dword& lsw, dword& msw)
}
struct Stopwatch {
union SplitQword {
struct {
uint32_t lsw;
uint32_t msw;
};
uint64_t qw { 0 };
};
public:
Stopwatch(const char* name)
: m_name(name)
{
read_tsc(m_start_lsw, m_start_msw);
read_tsc(m_start.lsw, m_start.msw);
}
~Stopwatch()
{
dword end_lsw;
dword end_msw;
read_tsc(end_lsw, end_msw);
if (m_start_msw != end_msw) {
dbgprintf("stopwatch: differing msw, no result for %s\n", m_name);
}
dword diff = end_lsw - m_start_lsw;
dbgprintf("Stopwatch(%s): %u ticks\n", m_name, diff);
SplitQword end;
read_tsc(end.lsw, end.msw);
uint64_t diff = end.qw - m_start.qw;
dbgprintf("Stopwatch(%s): %q ticks\n", m_name, diff);
}
private:
const char* m_name { nullptr };
dword m_start_lsw { 0 };
dword m_start_msw { 0 };
SplitQword m_start;
};