From b11e10e2c81c2b608176021364a36d84173358e3 Mon Sep 17 00:00:00 2001 From: Damien Zammit Date: Sun, 24 Sep 2023 10:35:10 +0000 Subject: percpu area using gs segment This speeds up smp again, by storing the struct processor in a percpu area and avoiding an expensive cpu_number every call of current_processor(), as well as getting the cpu_number by an offset into the percpu area. Untested on 64 bit and work remains to use other percpu arrays. TESTED: (NCPUS=8) -smp 1 boots to login shell ~2x slower than uniprocessor TESTED: (NCPUS=8) -smp 2 boots to INIT but hangs there TESTED: (NCPUS=8) -smp 4 gets stuck seemingly within rumpdisk and hangs TESTED: (NCPUS=1) uniprocessor is a bit faster than normal Message-Id: <20230924103428.455966-3-damien@zamaudio.com> --- kern/processor.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) (limited to 'kern/processor.c') diff --git a/kern/processor.c b/kern/processor.c index 2cd6d46c..76735381 100644 --- a/kern/processor.c +++ b/kern/processor.c @@ -60,14 +60,12 @@ struct kmem_cache pset_cache; int master_cpu; struct processor_set default_pset; -struct processor processor_array[NCPUS]; queue_head_t all_psets; int all_psets_count; def_simple_lock_data(, all_psets_lock); processor_t master_processor; -processor_t processor_ptr[NCPUS]; /* * Bootstrap the processor/pset system so the scheduler can run. @@ -81,10 +79,9 @@ void pset_sys_bootstrap(void) for (i = 0; i < NCPUS; i++) { /* * Initialize processor data structures. - * Note that cpu_to_processor(i) is processor_ptr[i]. + * Note that cpu_to_processor is processor_ptr. */ - processor_ptr[i] = &processor_array[i]; - processor_init(processor_ptr[i], i); + processor_init(processor_ptr(i), i); } master_processor = cpu_to_processor(master_cpu); queue_init(&all_psets); -- cgit v1.2.3