lavd_lavd: initial support for AMP (asynmmetric multi-processor) architecture #452
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added 6 commits
July 26, 2024 18:46
Remove unused constants and rename outdated constants to proper names (LAVD_TC_* to LAVC_CC_* and LAVD_ELIGIBLE_DSQ to LAVD_GLOBAL_DSQ). Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Signed-off-by: Changwoo Min <changwoo@igalia.com>
Previously, the core compaction assumed that each core's capacity was the same. Now, we additionally consider each core's max clock frequency. So, it always tries to use the higher-frequency cores first. Signed-off-by: Changwoo Min <changwoo@igalia.com>
With the --prefer-smt-core option is on, the core compaction prefers to utilizae hyper-twin first before utilizing the other physical CPUs. By default, the option is off. Signed-off-by: Changwoo Min <changwoo@igalia.com>
When a task is running on more performant core, the scheduler will give a longer time slice. On the other hand, on a less performant core, a shorter time slice will be assigned. The longer time slice helps boosting clock frequency on a performant core. Also, the shorter time slice gives more chance the performant core being utilized. Regarding the CPU capacity, we first check if kernel-provided capacitiy values are trustworthy or not. If not (i.e., all the same values), we rely on the user-provided value, based on each CPU's maximum clock frequency. Signed-off-by: Changwoo Min <changwoo@igalia.com>
htejun
approved these changes
Jul 26, 2024
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This is the initial support for AMP architecture, such as Intel Alder Lake (P/E). Initially, we tackle the problem from the core compaction point of view.
With these changes, the kernel compilation time (with default options) is reduced from 7:35 to 6:28 with "make -j3" on a 14-core (20-cpu) Raptor Lake processor.