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libsysprof: fallback to software perf counters

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If we fail to enable hardware perf counters, fallback to software perf
counters. This fixes Sysprof to work on Fedora Asahi.
This commit is contained in:
Christian Hergert
2023-10-23 22:27:04 +00:00
parent 98634cdaa6
commit d852115de1
1 changed files with 21 additions and 3 deletions
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24
src/libsysprof/sysprof-sampler.c
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@ -256,6 +256,7 @@ sysprof_sampler_prepare_fiber (gpointer user_data)
struct perf_event_attr attr = {0}; struct perf_event_attr attr = {0};
gboolean with_mmap2 = TRUE; gboolean with_mmap2 = TRUE;
guint n_cpu; guint n_cpu;
gboolean use_software = FALSE;
g_assert (prepare != NULL); g_assert (prepare != NULL);
g_assert (SYSPROF_IS_RECORDING (prepare->recording)); g_assert (SYSPROF_IS_RECORDING (prepare->recording));
@ -314,9 +315,18 @@ try_again:
attr.size = sizeof attr; attr.size = sizeof attr;
attr.type = PERF_TYPE_HARDWARE; if (use_software)
attr.config = PERF_COUNT_HW_CPU_CYCLES; {
attr.sample_period = 1200000; attr.type = PERF_TYPE_SOFTWARE;
attr.config = PERF_COUNT_SW_CPU_CLOCK;
attr.sample_period = 1000000;
}
else
{
attr.type = PERF_TYPE_HARDWARE;
attr.config = PERF_COUNT_HW_CPU_CYCLES;
attr.sample_period = 1200000;
}
if (!(connection = dex_await_object (dex_bus_get (G_BUS_TYPE_SYSTEM), &error))) if (!(connection = dex_await_object (dex_bus_get (G_BUS_TYPE_SYSTEM), &error)))
return dex_future_new_for_error (g_steal_pointer (&error)); return dex_future_new_for_error (g_steal_pointer (&error));
@ -367,6 +377,14 @@ try_again:
goto try_again; goto try_again;
} }
if (use_software == FALSE)
{
with_mmap2 = TRUE;
use_software = TRUE;
g_ptr_array_remove_range (futures, 0, futures->len);
goto try_again;
}
return dex_future_new_for_error (g_steal_pointer (&error)); return dex_future_new_for_error (g_steal_pointer (&error));
} }
} }