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| author | Damien Zammit <damien@zamaudio.com> | 2023-09-24 10:35:10 +0000 |
|---|---|---|
| committer | Samuel Thibault <samuel.thibault@ens-lyon.org> | 2023-09-24 14:38:03 +0200 |
| commit | b11e10e2c81c2b608176021364a36d84173358e3 (patch) | |
| tree | 8bde3f47151865143341e864040af3bde68385a5 /kern/processor.c | |
| parent | 31d45d0d8ee1d8eee96fc2a283a388b6b6aca669 (diff) | |
| download | gnumach-b11e10e2c81c2b608176021364a36d84173358e3.tar.gz gnumach-b11e10e2c81c2b608176021364a36d84173358e3.tar.bz2 gnumach-b11e10e2c81c2b608176021364a36d84173358e3.zip | |
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>
Diffstat (limited to 'kern/processor.c')
| -rw-r--r-- | kern/processor.c | 7 |
1 files changed, 2 insertions, 5 deletions
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); |