kernel/linux.git/Documentation/userspace-api/rseq.rst, branch v7.0-rc7

selftests/rseq: Add rseq slice histogram script

2026-01-22T10:11:20+00:00

A script that processes trace-cmd data and generates a histogram of rseq slice_ext durations for the recorded workload. Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260121143208.340549136@infradead.org

rseq: Lower default slice extension

2026-01-22T10:11:20+00:00

Change the minimum slice extension to 5 usec. Since slice_test selftest reaches a staggering ~350 nsec extension: Task: slice_test Mean: 350.266 ns Latency (us) | Count ------------------------------ EXPIRED | 238 0 us | 143189 1 us | 167 2 us | 26 3 us | 11 4 us | 28 5 us | 31 6 us | 22 7 us | 23 8 us | 32 9 us | 16 10 us | 35 Lower the minimal (and default) value to 5 usecs -- which is still massive. Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260121143208.073200729@infradead.org

rseq: Move slice_ext_nsec to debugfs

2026-01-22T10:11:20+00:00

Move changing the slice ext duration to debugfs, a sliglty less permanent interface. Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260121143207.923520192@infradead.org

rseq: Add fields and constants for time slice extension

2026-01-22T10:11:16+00:00

Aside of a Kconfig knob add the following items: - Two flag bits for the rseq user space ABI, which allow user space to query the availability and enablement without a syscall. - A new member to the user space ABI struct rseq, which is going to be used to communicate request and grant between kernel and user space. - A rseq state struct to hold the kernel state of this - Documentation of the new mechanism Signed-off-by: Thomas Gleixner Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20251215155708.669472597@linutronix.de