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63 lines
1.2 KiB
63 lines
1.2 KiB
// SPDX-License-Identifier: GPL-2.0 |
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#include <stdio.h> |
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#include "api/fs/fs.h" |
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#include "util/pmu.h" |
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#include "util/topdown.h" |
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/* |
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* Check whether we can use a group for top down. |
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* Without a group may get bad results due to multiplexing. |
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*/ |
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bool arch_topdown_check_group(bool *warn) |
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{ |
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int n; |
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if (sysctl__read_int("kernel/nmi_watchdog", &n) < 0) |
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return false; |
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if (n > 0) { |
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*warn = true; |
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return false; |
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} |
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return true; |
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} |
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void arch_topdown_group_warn(void) |
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{ |
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fprintf(stderr, |
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"nmi_watchdog enabled with topdown. May give wrong results.\n" |
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"Disable with echo 0 > /proc/sys/kernel/nmi_watchdog\n"); |
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} |
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#define TOPDOWN_SLOTS 0x0400 |
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static bool is_topdown_slots_event(struct evsel *counter) |
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{ |
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if (!counter->pmu_name) |
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return false; |
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if (strcmp(counter->pmu_name, "cpu")) |
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return false; |
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if (counter->core.attr.config == TOPDOWN_SLOTS) |
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return true; |
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return false; |
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} |
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/* |
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* Check whether a topdown group supports sample-read. |
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* |
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* Only Topdown metic supports sample-read. The slots |
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* event must be the leader of the topdown group. |
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*/ |
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bool arch_topdown_sample_read(struct evsel *leader) |
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{ |
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if (!pmu_have_event("cpu", "slots")) |
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return false; |
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if (is_topdown_slots_event(leader)) |
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return true; |
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return false; |
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}
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