mirror of
https://github.com/torvalds/linux.git
synced 2024-12-08 12:11:30 +00:00
[PATCH] disable addres space randomization default on transmeta CPUs
We know that the randomisation slows down some workloads on Transmeta CPUs by quite large amounts. We think it's because the CPU needs to recode the same x86 instructions when they pop up at a different virtual address after a fork+exec. So disable randomization by default on those CPUs. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
parent
3fef3fa24d
commit
cdf32eaa4e
@ -76,6 +76,10 @@ static void __init init_transmeta(struct cpuinfo_x86 *c)
|
||||
#define USER686 (X86_FEATURE_TSC|X86_FEATURE_CX8|X86_FEATURE_CMOV)
|
||||
if ( c->x86 == 5 && (c->x86_capability[0] & USER686) == USER686 )
|
||||
c->x86 = 6;
|
||||
|
||||
/* randomize_va_space slows us down enormously;
|
||||
it probably triggers retranslation of x86->native bytecode */
|
||||
randomize_va_space = 0;
|
||||
}
|
||||
|
||||
static void transmeta_identify(struct cpuinfo_x86 * c)
|
||||
|
Loading…
Reference in New Issue
Block a user