mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-25 20:14:25 +08:00
1524b74540
Pull full dynticks support for virt guests from Frederic Weisbecker: "Some measurements showed that disabling the tick on the host while the guest is running can be interesting on some workloads. Indeed the host tick is irrelevant while a vcpu runs, it consumes CPU time and cache footprint for no good reasons. Full dynticks already works in every context, but RCU prevents it to be effective outside userspace, because the CPU needs to take part of RCU grace period completion as long as RCU may be used on it, which is the case in kernel context. However guest is similar to userspace and idle in that we know RCU is unused on such context. Therefore a CPU in guest/userspace/idle context can let other CPUs report its own RCU quiescent state on its behalf and shut down the tick safely, provided it isn't needed for other reasons than RCU. This is called RCU extended quiescent state. This was already implemented for idle and userspace. This patchset now brings it for guest contexts through the following steps: - Generalize the context tracking APIs to also track guest state - Rename/sanitize a few CPP symbols accordingly - Report guest entry/exit to RCU and define this context area as an RCU extended quiescent state." Signed-off-by: Ingo Molnar <mingo@kernel.org> |
||
---|---|---|
.. | ||
boot | ||
configs | ||
crypto | ||
ia32 | ||
include | ||
kernel | ||
kvm | ||
lguest | ||
lib | ||
math-emu | ||
mm | ||
net | ||
oprofile | ||
pci | ||
platform | ||
power | ||
purgatory | ||
realmode | ||
syscalls | ||
tools | ||
um | ||
vdso | ||
video | ||
xen | ||
.gitignore | ||
Kbuild | ||
Kconfig | ||
Kconfig.cpu | ||
Kconfig.debug | ||
Makefile | ||
Makefile_32.cpu | ||
Makefile.um |