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x86/resctrl: Initialize a new resource group with default MBA values

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Currently, when a new resource group is created, the allocation values
of the MBA resource are not initialized and remain meaningless data.

For example:

  mkdir /sys/fs/resctrl/p1
  cat /sys/fs/resctrl/p1/schemata
  MB:0=100;1=100

  echo "MB:0=10;1=20" > /sys/fs/resctrl/p1/schemata
  cat /sys/fs/resctrl/p1/schemata
  MB:0= 10;1= 20

  rmdir /sys/fs/resctrl/p1
  mkdir /sys/fs/resctrl/p2
  cat /sys/fs/resctrl/p2/schemata
  MB:0= 10;1= 20

Therefore, when the new group is created, it is reasonable to initialize
MBA resource with default values.

Initialize the MBA resource and cache resources in separate functions.

 [ bp: Add newlines between code blocks for better readability. ]

Signed-off-by: Xiaochen Shen <xiaochen.shen@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Fenghua Yu <fenghua.yu@intel.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: pei.p.jia@intel.com
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/1555499329-1170-3-git-send-email-xiaochen.shen@intel.com
This commit is contained in:
Xiaochen Shen
2019-04-17 19:08:49 +08:00
committed by Borislav Petkov
parent 7390619ab9
commit 47820e73f5
2 changed files with 36 additions and 22 deletions
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4
arch/x86/kernel/cpu/resctrl/ctrlmondata.c
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@@ -342,10 +342,10 @@ int update_domains(struct rdt_resource *r, int closid)
if (cpumask_empty(cpu_mask) || mba_sc)
goto done;
cpu = get_cpu();
/* Update CBM on this cpu if it's in cpu_mask. */
/* Update resource control msr on this CPU if it's in cpu_mask. */
if (cpumask_test_cpu(cpu, cpu_mask))
rdt_ctrl_update(&msr_param);
/* Update CBM on other cpus. */
/* Update resource control msr on other CPUs. */
smp_call_function_many(cpu_mask, rdt_ctrl_update, &msr_param, 1);
put_cpu();