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ea16f0ea6c
We use task_util() in find_idlest_group() via capacity_spare_wake(). This task_util() updated in wake_cap(). However wake_cap() is not the only reason for ending up in find_idlest_group() - we could have been sent there by wake_wide(). So explicitly sync the task util with prev_cpu when we are about to head to find_idlest_group(). We could simply do this at the beginning of select_task_rq_fair() (i.e. irrespective of whether we're heading to select_idle_sibling() or find_idlest_group() & co), but I didn't want to slow down the select_idle_sibling() path more than necessary. Don't do this during fork balancing, we won't need the task_util and we'd just clobber the last_update_time, which is supposed to be 0. Signed-off-by: Brendan Jackman <brendan.jackman@arm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Andres Oportus <andresoportus@google.com> Cc: Dietmar Eggemann <dietmar.eggemann@arm.com> Cc: Joel Fernandes <joelaf@google.com> Cc: Josef Bacik <josef@toxicpanda.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Morten Rasmussen <morten.rasmussen@arm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vincent Guittot <vincent.guittot@linaro.org> Link: http://lkml.kernel.org/r/20170808095519.10077-1-brendan.jackman@arm.com Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. Please read the Documentation/process/changes.rst file, as it contains the requirements for building and running the kernel, and information about the problems which may result by upgrading your kernel.