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[Tool] (P11 B2): extmem probe --hold-ms - the T0S child keeps its AHardwareBuffer locked while the parent holds both imports, for the dmabuf memory calibration

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swung0x48
2026-09-29 17:50:50 -04:00
parent 2522f1803c
commit 17f1c0b59b
1 changed files with 13 additions and 1 deletions
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tools/spikes/extmem_probe/extmem_probe.cpp
+13 -1
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@@ -273,6 +273,10 @@ static int64_t checkPattern(const void* p, uint64_t bytes, uint32_t seed) {
// proves the far end of the allocation is mapped and GPU-reachable, not only its first
// pages. The parent hands the value to every child with --region-base=.
static uint64_t gRegionBase = 0;
// --hold-ms=N (P11 B2 memory calibration): the T0S client keeps its AHB locked this long after
// the last round, while the parent still holds its Vulkan and GL imports, so an outside sampler
// can read what a held, imported AHB of --size bytes costs in each accounting.
static uint32_t gHoldMs = 0;
static uint64_t regOff(int region) { return gRegionBase + (uint64_t)region * kRegion; }
static void writeRegion(void* base, int region, uint32_t seed) {
@@ -1371,7 +1375,9 @@ static pid_t spawnChild(const char* route, int* parentSock) {
ssize_t n = readlink("/proc/self/exe", self, sizeof(self) - 1);
if (n <= 0) _exit(90);
self[n] = 0;
char* argv[] = {self, arg, base, nullptr};
char hold[64];
snprintf(hold, sizeof(hold), "--hold-ms=%u", gHoldMs);
char* argv[] = {self, arg, base, hold, nullptr};
execv(self, argv);
_exit(91);
}
@@ -2871,6 +2877,10 @@ static int t0sClientRounds(int sock, AHardwareBuffer* ahb, void* p, int lockRc,
}
T0SDone dn{};
dn.lockRc = lockRc;
if (gHoldMs) {
pr("child: holding the locked AHB (%p) for %u ms", p, gHoldMs);
usleep(static_cast<useconds_t>(gHoldMs) * 1000u);
}
dn.unlockRc = AHardwareBuffer_unlock(ahb, nullptr);
void* q = nullptr;
dn.relockRc = AHardwareBuffer_lock(ahb, AHARDWAREBUFFER_USAGE_CPU_READ_OFTEN, -1, nullptr, &q);
@@ -4108,6 +4118,8 @@ int main(int argc, char** argv) {
routeEndpoint = a + 15;
} else if (!strncmp(a, "--size=", 7)) {
size = strtoull(a + 7, nullptr, 0);
} else if (!strncmp(a, "--hold-ms=", 10)) {
gHoldMs = (uint32_t)strtoul(a + 10, nullptr, 0);
} else if (!strncmp(a, "--region-base=", 14)) {
gRegionBase = strtoull(a + 14, nullptr, 0);
} else if (!strcmp(a, "--regions-at-end")) {