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clock: remove 64-bit perf support for 32-bit systems

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Remove atomic64-based 64-bit perf counter support for 32-bit systems
where atomic64 operations are unavailable, simplifying userspace perf
implementation to avoid unsupported atomic operations.

Signed-off-by: hujun5 <hujun5@xiaomi.com>
This commit is contained in:
hujun5
2025-08-28 09:55:27 +08:00
committed by Donny(董九柱)
parent 8f0e30b07c
commit a89b7f7add
1 changed files with 0 additions and 50 deletions
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libs/libc/sched/clock_perf.c
-50
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@@ -24,61 +24,13 @@
* Included Files
****************************************************************************/
#include <stdint.h>
#include <nuttx/arch.h>
#include <nuttx/bits.h>
#include <nuttx/clock.h>
#if defined(CONFIG_PERF_OVERFLOW_CORRECTION) && ULONG_MAX != UINT64_MAX
/****************************************************************************
* Preprocessors
****************************************************************************/
#define MASK_LO GENMASK_ULL(31, 0)
#define MASK_HI GENMASK_ULL(63, 32)
#define LO(x) (uint32_t)((x) & MASK_LO)
#define HI(x) (uint32_t)(((x) & MASK_HI) >> 32)
#define PACK64(hi,lo) ((MASK_LO & (lo)) | (((uint64_t)(hi)) << 32))
#define CLOCK_T(p) (LO(p) | ((clock_t)HI(p) << \
CONFIG_ARCH_PERF_COUNT_BITWIDTH))
/****************************************************************************
* Private Data
****************************************************************************/
static atomic64_t g_perf; /* hi word is overflow, lo word is last */
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* perf_gettime
****************************************************************************/
clock_t perf_gettime(void)
{
uint64_t snap;
uint64_t result;
clock_t now;
do
{
snap = atomic64_read(&g_perf);
now = up_perf_gettime();
result = PACK64(now < LO(snap) ? HI(snap) + 1 : HI(snap), now);
}
while (!atomic64_try_cmpxchg(&g_perf, &snap, result));
return CLOCK_T(result);
}
#else
/****************************************************************************
* perf_gettime
****************************************************************************/
@@ -87,5 +39,3 @@ clock_t perf_gettime(void)
{
return up_perf_gettime();
}
#endif