-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 08/10/2011 10:03 PM, Mike Turquette wrote: > On some platforms it is possible to have some CPUs which support CPU > hotplug and some which do not. Currently the prescence of an 'online' > sysfs entry in userspace is adequate for applications to know that a CPU > supports hotplug, but there is no convenient way to make the same > determination in the kernel. > > To better model this relationship this patch introduces a new cpumask to > track CPUs that support CPU hotplug operations. > > This new cpumask is populated at boot-time and remains static for the > life of the machine. Bits set in the mask indicate a CPU which supports > hotplug, but make no guarantees about whether that CPU is currently > online or not. Likewise a cleared bit in the mask indicates either a > CPU which cannot hotplug or a lack of a populated CPU. > > The purpose of this new cpumask is to aid kernel code which uses CPU to > take CPUs online and offline. Possible uses are as a thermal event > mitigation technique or as a power capping mechanism. > > Signed-off-by: Mike Turquette <mturquette@xxxxxx> Reviewed-by: Daniel Lezcano <daniel.lezcano@xxxxxxxxxx> - -- <http://www.linaro.org/> Linaro.org ? Open source software for ARM SoCs Follow Linaro: <http://www.facebook.com/pages/Linaro> Facebook | <http://twitter.com/#!/linaroorg> Twitter | <http://www.linaro.org/linaro-blog/> Blog -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEcBAEBAgAGBQJOQu/KAAoJEAKBbMCpUGYAxnoH/0+WtrRGq0oOjkU8jIxzAEUP OW6S7EQT13v97YapaEwUZpHOzrdeEa9bV5sVI3uc3H9n6dnQbh25eMuhiH/dTwF6 LHV1Tdv7/+ghiSc4NJunpXjAsObezUgTV9n2Zoip3kAfhMdV5DntJu0Izkdb5lkA AD5CqV6oHqC0spa2/nMMeOYsdp3hLP3hA5wCyE8a2rxvbytxl2jRVommXOpF3AnI s3OS7oyVFLpdvxVdAio1cXvM6vILtJFArAqw88AJUBsUsuehRxeOYVvTR3/z4RZD LNEH72IkGY/8OVYp9/VoixWgWTUhXUR5BZwAjCP7a+xQk/1qK1LAM+/CXimwND0= =90gJ -----END PGP SIGNATURE----- _______________________________________________ linux-pm mailing list linux-pm@xxxxxxxxxxxxxxxxxxxxxxxxxx https://lists.linux-foundation.org/mailman/listinfo/linux-pm
