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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/cpu_number.h | |
| 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/cpu_number.h')
| -rw-r--r-- | kern/cpu_number.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kern/cpu_number.h b/kern/cpu_number.h index 0be2d338..1abe3dbb 100644 --- a/kern/cpu_number.h +++ b/kern/cpu_number.h @@ -37,7 +37,8 @@ extern int master_cpu; /* 'master' processor - keeps time */ #if (NCPUS == 1) /* cpu number is always 0 on a single processor system */ -#define cpu_number() (0) +#define cpu_number() (0) +#define cpu_number_slow() (0) #endif /* NCPUS == 1 */ |