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x86/resctrl: Optimize cpumask_any_housekeeping()

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With the lack of cpumask_any_andnot_but(), cpumask_any_housekeeping()
has to abuse cpumask_nth() functions.

Update cpumask_any_housekeeping() to use the new cpumask_any_but()
and cpumask_any_andnot_but(). These two functions understand
RESCTRL_PICK_ANY_CPU, which simplifies cpumask_any_housekeeping()
significantly.

Signed-off-by: Yury Norov [NVIDIA] <yury.norov@gmail.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: James Morse <james.morse@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: Fenghua Yu <fenghuay@nvidia.com>
Tested-by: James Morse <james.morse@arm.com>
Tested-by: Shaopeng Tan <tan.shaopeng@jp.fujitsu.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250515165855.31452-5-james.morse@arm.com
This commit is contained in:
Yury Norov [NVIDIA]
2025-05-15 16:58:34 +00:00
committed by Borislav Petkov (AMD)
parent 5da703ef4e
commit 94f7531430
1 changed files with 7 additions and 21 deletions
Download Patch File Download Diff File Expand all files Collapse all files

28
arch/x86/kernel/cpu/resctrl/internal.h
View File

@@ -47,30 +47,16 @@
static inline unsigned int
cpumask_any_housekeeping(const struct cpumask *mask, int exclude_cpu)
{
unsigned int cpu, hk_cpu;
if (exclude_cpu == RESCTRL_PICK_ANY_CPU)
cpu = cpumask_any(mask);
else
cpu = cpumask_any_but(mask, exclude_cpu);
/* Only continue if tick_nohz_full_mask has been initialized. */
if (!tick_nohz_full_enabled())
return cpu;
/* If the CPU picked isn't marked nohz_full nothing more needs doing. */
if (cpu < nr_cpu_ids && !tick_nohz_full_cpu(cpu))
return cpu;
unsigned int cpu;
/* Try to find a CPU that isn't nohz_full to use in preference */
hk_cpu = cpumask_nth_andnot(0, mask, tick_nohz_full_mask);
if (hk_cpu == exclude_cpu)
hk_cpu = cpumask_nth_andnot(1, mask, tick_nohz_full_mask);
if (tick_nohz_full_enabled()) {
cpu = cpumask_any_andnot_but(mask, tick_nohz_full_mask, exclude_cpu);
if (cpu < nr_cpu_ids)
return cpu;
}
if (hk_cpu < nr_cpu_ids)
cpu = hk_cpu;
return cpu;
return cpumask_any_but(mask, exclude_cpu);
}
struct rdt_fs_context {