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authorLinus Torvalds <torvalds@linux-foundation.org>2012-12-14 10:20:43 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2012-12-14 10:20:43 -0500
commit17bc14b767cf0692420c43dbe5310ae98a5a7836 (patch)
tree9b0f339e5d9769a51acdeb7a246f6e7522efa966 /drivers/base
parent7313264b899bbf3988841296265a6e0e8a7b6521 (diff)
Revert "sched: Update_cfs_shares at period edge"
This reverts commit f269ae0469fc882332bdfb5db15d3c1315fe2a10. It turns out it causes a very noticeable interactivity regression with CONFIG_SCHED_AUTOGROUP (test-case: "make -j32" of the kernel in a terminal window, while scrolling in a browser - the autogrouping means that the two end up in separate cgroups, and the browser should be smooth as silk despite the high load). Says Paul Turner: "It seems that the update-throttling on the wake-side is reducing the interactive tasks' ability to preempt. While I suspect the right longer term answer here is force these updates only in the cross-cgroup case; this is less trivial. For this release I believe the right answer is either going to be a revert or restore the updates on the enqueue-side." Reported-by: Linus Torvalds <torvalds@linux-foundation.org> Bisected-by: Mike Galbraith <efault@gmx.de> Acked-by: Paul Turner <pjt@google.com> Acked-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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