commit | a0195f314a25582b38993bf30db11c300f4f4611 | [log] [tgz] |
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author | Fenghua Yu <fenghua.yu@intel.com> | Thu Dec 17 14:31:19 2020 -0800 |
committer | Borislav Petkov <bp@suse.de> | Fri Jan 08 09:08:03 2021 +0100 |
tree | 64fa158d93d3c5b1ccf2ff5d59a5327155a9a8fc | |
parent | ae28d1aae48a1258bd09a6f707ebb4231d79a761 [diff] |
x86/resctrl: Don't move a task to the same resource group Shakeel Butt reported in [1] that a user can request a task to be moved to a resource group even if the task is already in the group. It just wastes time to do the move operation which could be costly to send IPI to a different CPU. Add a sanity check to ensure that the move operation only happens when the task is not already in the resource group. [1] https://lore.kernel.org/lkml/CALvZod7E9zzHwenzf7objzGKsdBmVwTgEJ0nPgs0LUFU3SN5Pw@mail.gmail.com/ Fixes: e02737d5b826 ("x86/intel_rdt: Add tasks files") Reported-by: Shakeel Butt <shakeelb@google.com> Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Signed-off-by: Reinette Chatre <reinette.chatre@intel.com> Signed-off-by: Borislav Petkov <bp@suse.de> Reviewed-by: Tony Luck <tony.luck@intel.com> Cc: stable@vger.kernel.org Link: https://lkml.kernel.org/r/962ede65d8e95be793cb61102cca37f7bb018e66.1608243147.git.reinette.chatre@intel.com