Displaying 2 results from an estimated 2 matches for "check_cx".
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check_c
2013 Nov 11
1
[PATCH] x86/idle: reduce contention on ACPI register accesses
...t_register(ACPI_BITREG_ARB_DISABLE, 0);
- c3_cpu_status.count--;
+ if ( c3_cpu_status.count-- == num_online_cpus() )
+ acpi_set_register(ACPI_BITREG_ARB_DISABLE, 0);
spin_unlock(&c3_cpu_status.lock);
}
@@ -821,12 +821,10 @@ static int check_cx(struct acpi_processo
return -EINVAL;
/* All the logic here assumes flags.bm_check is same across all CPUs */
- if ( bm_check_flag == -1 )
+ if ( bm_check_flag < 0 )
{
/* Determine whether bm_check is needed based on CPU */...
2011 Aug 15
36
expose MWAIT to dom0
There''re basically two methods to enter a given C-state: legacy (hlt + I/O read),
and native(using mwait). MWAIT is always preferred when both underlying CPU
and OS support, which is a more efficient way to conduct C-state transition.
Xen PM relies on Dom0 to parse ACPI Cx/Px information, which involves one
step to notify BIOS about a set of capabilities supported by OSPM. One capability