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author | 2023-08-26 09:57:43 +0000 | |
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committer | 2023-08-29 20:41:29 +0200 | |
commit | 4c2fdf7393647a7b01a83f49c4a331d562016640 (patch) | |
tree | cedfea0660e686d0049467d67d8f4fb5ec9e01ae /tools/perf/scripts/python/export-to-postgresql.py | |
parent | cpufreq: governor: Free dbs_data directly when gov->init() fails (diff) | |
download | wireguard-linux-4c2fdf7393647a7b01a83f49c4a331d562016640.tar.xz wireguard-linux-4c2fdf7393647a7b01a83f49c4a331d562016640.zip |
cpufreq: pcc: Fix the potentinal scheduling delays in target_index()
pcc_cpufreq_target():
cpufreq_freq_transition_begin();
spin_lock(&pcc_lock);
[critical section]
cpufreq_freq_transition_end();
spin_unlock(&pcc_lock);
Above code has a performance issue, consider that Task0 executes
'cpufreq_freq_transition_end()' to wake Task1 and preempted imediatedly
without releasing 'pcc_lock', then Task1 needs to wait for Task0 to
release 'pcc_lock'. In the worst case, this locking order can result in
Task1 wasting two scheduling rounds before it can enter the critical
section.
Signed-off-by: Liao Chang <liaochang1@huawei.com>
Acked-by: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'tools/perf/scripts/python/export-to-postgresql.py')
0 files changed, 0 insertions, 0 deletions