| Message ID | ZzsN9wNpuDnGqKnM@pavilion.home (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | [GIT,PULL] RCU changes for v6.13 | expand |
The pull request you sent on Mon, 18 Nov 2024 10:50:47 +0100:
> git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu.release.v6.13
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/8cdf2d19038fa266806d15603d691dc2fd774858
Thank you!
Hello Linus, The following changes since commit f7345ccc62a4b880cf76458db5f320725f28e400: rcu/nocb: Fix rcuog wake-up from offline softirq (2024-10-10 22:18:19 +0530) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/rcu/linux.git tags/rcu.release.v6.13 for you to fetch changes up to d8dfba2c606ac9fa763ce3c51dcbf7335544b815: Merge branches 'rcu/fixes', 'rcu/nocb', 'rcu/torture', 'rcu/stall' and 'rcu/srcu' into rcu/dev (2024-11-15 22:38:53 +0100) ---------------------------------------------------------------- RCU pull request for v6.13 SRCU: - Introduction of the new SRCU-lite flavour with a new pair of srcu_read_[un]lock_lite() APIs. In practice the read side using this flavour becomes lighter by removing a full memory barrier on LOCK and a full memory barrier on UNLOCK. This comes at the expense of a higher latency write side with two (in the best case of a snaphot of unused read-sides) or more RCU grace periods on the update side which now assumes by itself the whole full ordering guarantee against the LOCK/UNLOCK counters on both indexes, along with the accesses performed inside. Uretprobes is a known potential user. Note this doesn't replace the default normal flavour of SRCU which still behaves the same as usual. - Add testing of SRCU-lite through rcutorture and rcuscale - Various cleanups on the way. FIXES: - Allow short-circuiting RCU-TASKS-RUDE grace periods on architectures that have sane noinstr boundaries forbidding tracing on low-level idle and kernel entry code. RCU-TASKS is enough on such configurations because it involves an RCU grace period that waits for all idle tasks to either schedule out voluntarily or enter into RCU unwatched noinstr code. - Allow and test start_poll_synchronize_rcu() with IRQs disabled. - Mention rcuog kthreads in relevant documentation and Kconfig help - Various fixes and consolidations RCUTORTURE: - Add --no-affinity on tools to leave the affinity setting of guests up to the user. - Add guest_os_delay parameter to rcuscale for better warm-up control. - Fix and improve some rcuscale error handling. - Various cleanups and fixes STALL: - Remove dead code - Stop dumping tasks if a stalled grace period eventually ended midway as that only produces confusing output. - Optimize detection of stalling CPUs and avoid useless node locking otherwise. NOCB: - Fix rcu_barrier() hang due to a race against callbacks deoffloading. This is not yet used, except by rcutorture, and waits for its promised cpusets interface. - Remove leftover function declaration ---------------------------------------------------------------- Baruch Siach (1): doc: rcu: update printed dynticks counter bits Frederic Weisbecker (1): Merge branches 'rcu/fixes', 'rcu/nocb', 'rcu/torture', 'rcu/stall' and 'rcu/srcu' into rcu/dev Hongbo Li (1): rcu: Use bitwise instead of arithmetic operator for flags Jinjie Ruan (1): rcu: Use the BITS_PER_LONG macro Michal Schmidt (1): rcu/srcutiny: don't return before reenabling preemption Paul E. McKenney (32): rcu: Delete unused rcu_gp_might_be_stalled() function rcu: Stop stall warning from dumping stacks if grace period ends srcu: Rename srcu_might_be_idle() to srcu_should_expedite() srcu: Introduce srcu_gp_is_expedited() helper function rcu: Finer-grained grace-period-end checks in rcu_dump_cpu_stacks() srcu: Renaming in preparation for additional reader flavor srcu: Bit manipulation changes for additional reader flavor srcu: Standardize srcu_data pointers to "sdp" and similar srcu: Improve srcu_read_lock{,_nmisafe}() comments srcu: Create CPP macros for normal and NMI-safe SRCU readers srcu: Add srcu_read_lock_lite() and srcu_read_unlock_lite() srcu: Allow inlining of __srcu_read_{,un}lock_lite() rcutorture: Expand RCUTORTURE_RDR_MASK_[12] to eight bits rcutorture: Add reader_flavor parameter for SRCU readers rcutorture: Add srcu_read_lock_lite() support to rcutorture.reader_flavor rcutorture: Add light-weight SRCU scenario refscale: Add srcu_read_lock_lite() support using "srcu-lite" srcu: Improve srcu_read_lock_lite() kernel-doc comment rcu: Add rcuog kthreads to RCU_NOCB_CPU help text doc: Add rcuog kthreads to kernel-per-CPU-kthreads.rst rcu: Allow short-circuiting of synchronize_rcu_tasks_rude() rcu: Permit start_poll_synchronize_rcu*() with interrupts disabled rcutorture: Test start-poll primitives with interrupts disabled doc: Remove kernel-parameters.txt entry for rcutorture.read_exit rcu-tasks: Remove open-coded one-byte cmpxchg() emulation torture: Add --no-affinity parameter to kvm.sh refscale: Correct affinity check rcuscale: Add guest_os_delay module parameter rcutorture: Avoid printing cpu=-1 for no-fault RCU boost failure srcu: Remove smp_mb() from srcu_read_unlock_lite() srcu: Check for srcu_read_lock_lite() across all CPUs srcu: Unconditionally record srcu_read_lock_lite() in ->srcu_reader_flavor Uladzislau Rezki (Sony) (3): rcu/kvfree: Fix data-race in __mod_timer / kvfree_call_rcu rcuscale: Do a proper cleanup if kfree_scale_init() fails rcuscale: Remove redundant WARN_ON_ONCE() splat Yue Haibing (1): rcu: Remove unused declaration rcu_segcblist_offload() Zhen Lei (1): srcu: Replace WARN_ON_ONCE() with BUILD_BUG_ON() if possible Zqiang (1): rcu/nocb: Fix missed RCU barrier on deoffloading Documentation/RCU/stallwarn.rst | 2 +- Documentation/admin-guide/kernel-parameters.txt | 13 +- .../admin-guide/kernel-per-CPU-kthreads.rst | 2 +- include/linux/rcutiny.h | 1 - include/linux/rcutree.h | 1 - include/linux/srcu.h | 92 ++++++++++---- include/linux/srcutiny.h | 3 + include/linux/srcutree.h | 67 ++++++++++- kernel/rcu/Kconfig | 28 +++-- kernel/rcu/rcu_segcblist.h | 1 - kernel/rcu/rcuscale.c | 8 +- kernel/rcu/rcutorture.c | 84 +++++++++---- kernel/rcu/refscale.c | 56 ++++++++- kernel/rcu/srcutiny.c | 2 +- kernel/rcu/srcutree.c | 133 +++++++++++++-------- kernel/rcu/tasks.h | 20 +--- kernel/rcu/tree.c | 24 ++-- kernel/rcu/tree_nocb.h | 13 +- kernel/rcu/tree_plugin.h | 22 ++-- kernel/rcu/tree_stall.h | 57 +++------ .../rcutorture/bin/kvm-test-1-run-batch.sh | 43 +++---- tools/testing/selftests/rcutorture/bin/kvm.sh | 6 + .../selftests/rcutorture/configs/rcu/CFLIST | 1 + .../selftests/rcutorture/configs/rcu/SRCU-L | 10 ++ .../selftests/rcutorture/configs/rcu/SRCU-L.boot | 3 + .../selftests/rcutorture/configs/rcu/SRCU-N.boot | 1 + .../selftests/rcutorture/configs/rcu/TREE10 | 2 +- 27 files changed, 468 insertions(+), 227 deletions(-) create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-L create mode 100644 tools/testing/selftests/rcutorture/configs/rcu/SRCU-L.boot