On Tue, Feb 18, 2025 at 08:35:23PM +0000, Jay Wang wrote: > commit 70e6b7d9ae3c63df90a7bba7700e8d5c300c3c60 upstream > > Leaving the PIT interrupt running can cause noticeable steal time for > virtual guests. The VMM generally has a timer which toggles the IRQ input > to the PIC and I/O APIC, which takes CPU time away from the guest. Even > on real hardware, running the counter may use power needlessly (albeit > not much). > > Make sure it's turned off if it isn't going to be used. > > Signed-off-by: David Woodhouse <dwmw@xxxxxxxxxxxx> > Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx> > Tested-by: Michael Kelley <mhkelley@xxxxxxxxxxx> > Link: https://lore.kernel.org/all/20240802135555.564941-1-dwmw2@xxxxxxxxxxxxx > Signed-off-by: Jay Wang <wanjay@xxxxxxxxxx> > Cc: stable@xxxxxxxxxxxxxxx #v5.10/v5.15/v6.1 > --- > arch/x86/kernel/i8253.c | 11 +++++++++-- > drivers/clocksource/i8253.c | 13 +++++++++---- > include/linux/i8253.h | 1 + > 3 files changed, 19 insertions(+), 6 deletions(-) Why don't you also want this in 6.6.y? You can't submit patches for only older kernels without them also being in newer ones, otherwise you will get a regression when upgrading. Please always submit patches for all relevant kernel trees. thanks, greg k-h
