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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-27 10:05:51 +0000 |
commit | 5d1646d90e1f2cceb9f0828f4b28318cd0ec7744 (patch) | |
tree | a94efe259b9009378be6d90eb30d2b019d95c194 /tools/perf/arch/x86/util/topdown.c | |
parent | Initial commit. (diff) | |
download | linux-430c2fc249ea5c0536abd21c23382884005c9093.tar.xz linux-430c2fc249ea5c0536abd21c23382884005c9093.zip |
Adding upstream version 5.10.209.upstream/5.10.209upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'tools/perf/arch/x86/util/topdown.c')
-rw-r--r-- | tools/perf/arch/x86/util/topdown.c | 63 |
1 files changed, 63 insertions, 0 deletions
diff --git a/tools/perf/arch/x86/util/topdown.c b/tools/perf/arch/x86/util/topdown.c new file mode 100644 index 000000000..2f3d96aa9 --- /dev/null +++ b/tools/perf/arch/x86/util/topdown.c @@ -0,0 +1,63 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <stdio.h> +#include "api/fs/fs.h" +#include "util/pmu.h" +#include "util/topdown.h" + +/* + * Check whether we can use a group for top down. + * Without a group may get bad results due to multiplexing. + */ +bool arch_topdown_check_group(bool *warn) +{ + int n; + + if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0) + return false; + if (n > 0) { + *warn = true; + return false; + } + return true; +} + +void arch_topdown_group_warn(void) +{ + fprintf(stderr, + "nmi_watchdog enabled with topdown. May give wrong results.\n" + "Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n"); +} + +#define TOPDOWN_SLOTS 0x0400 + +static bool is_topdown_slots_event(struct evsel *counter) +{ + if (!counter->pmu_name) + return false; + + if (strcmp(counter->pmu_name, "cpu")) + return false; + + if (counter->core.attr.config == TOPDOWN_SLOTS) + return true; + + return false; +} + +/* + * Check whether a topdown group supports sample-read. + * + * Only Topdown metic supports sample-read. The slots + * event must be the leader of the topdown group. + */ + +bool arch_topdown_sample_read(struct evsel *leader) +{ + if (!pmu_have_event("cpu", "slots")) + return false; + + if (is_topdown_slots_event(leader)) + return true; + + return false; +} |