* [GIT PULL] CSD-lock changes for v6.13
@ 2024-11-17 18:37 Paul E. McKenney
2024-11-19 19:06 ` pr-tracker-bot
0 siblings, 1 reply; 2+ messages in thread
From: Paul E. McKenney @ 2024-11-17 18:37 UTC (permalink / raw)
To: torvalds
Cc: linux-kernel, kernel-team, riel, neeraj.upadhyay, leobras, tglx, peterz
Hello, Linus,
When the v6.13 merge window opens, please pull this CSD-lock update from:
git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/csd-lock.2024.11.16a
# HEAD: 9861f7f66f98a6358c944c17a5d4acd07abcb1a7: locking/csd-lock: Switch from sched_clock() to ktime_get_mono_fast_ns() (2024-10-11 09:31:21 -0700)
----------------------------------------------------------------
CSD-lock diagnostic updates for v6.13
This commit switches from sched_clock() to ktime_get_mono_fast_ns(), which
on x86 switches from the rdtsc instruction to the rdtscp instruction,
thus avoiding instruction reorderings that cause false-positive reports
of CSD-lock stalls of almost 2^46 nanoseconds. These false positives
are rare, but really are seen in the wild.
----------------------------------------------------------------
Paul E. McKenney (1):
locking/csd-lock: Switch from sched_clock() to ktime_get_mono_fast_ns()
kernel/smp.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: [GIT PULL] CSD-lock changes for v6.13
2024-11-17 18:37 [GIT PULL] CSD-lock changes for v6.13 Paul E. McKenney
@ 2024-11-19 19:06 ` pr-tracker-bot
0 siblings, 0 replies; 2+ messages in thread
From: pr-tracker-bot @ 2024-11-19 19:06 UTC (permalink / raw)
To: Paul E. McKenney
Cc: torvalds, linux-kernel, kernel-team, riel, neeraj.upadhyay,
leobras, tglx, peterz
The pull request you sent on Sun, 17 Nov 2024 10:37:34 -0800:
> git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git tags/csd-lock.2024.11.16a
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/311e062ad504bdf49e93cb88a22ba04d5134111c
Thank you!
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