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339d80d5f2
Calling sched_setscheduler twice every sample period has high CPU
overhead. For intel and panfrost, their dump_perfcnt is preemptible and
they don't need the scheduler change.
For freedreno, simply makes the main thread RT at all time. This solves
most of the cpu overhead issue.
v2: removed pthread_t param and just change the scheduler for the
calling thread
Acked-by: Rob Clark <robdclark@chromium.org> (v1)
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/19668>
38 lines
824 B
C++
38 lines
824 B
C++
/*
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* Copyright © 2020 Collabora, Ltd.
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* Author: Antonio Caggiano <antonio.caggiano@collabora.com>
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*
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* SPDX-License-Identifier: MIT
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*/
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#include "pps.h"
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#include <cerrno>
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#include <cstring>
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#include <sched.h>
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namespace pps
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{
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bool check(int res, const char *msg)
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{
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if (res < 0) {
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char *err_msg = std::strerror(errno);
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PERFETTO_ELOG("%s: %s", msg, err_msg);
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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 make_thread_rt()
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{
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// Use FIFO policy to avoid preemption while collecting counters
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int sched_policy = SCHED_FIFO;
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// Do not use max priority to avoid starving migration and watchdog threads
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int priority_value = sched_get_priority_max(sched_policy) - 1;
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sched_param priority_param { priority_value };
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sched_setscheduler(0, sched_policy, &priority_param);
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}
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} // namespace pps
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