github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-11-07 06:17:02 +01:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

srcutree: Skip callback scheduling for atomic SRCU grace periods

Browse Source 
call_srcu() is forbidden on atomic srcu_struct, so srcu_gp_end() never
has callbacks to invoke for them.  Yet it schedules callback invocation,
which for atomic SRCU's SRCU_SIZE_SMALL state arms the boot CPU's
->delay_work timer every grace period, only for srcu_invoke_callbacks()
to find nothing to do.

Skip this for atomic SRCU.

Signed-off-by: Kunwu Chan <kunwu.chan@gmail.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
This commit is contained in:
Kunwu Chan 2026-09-07 15:58:26 +08:00 committed by Paul E. McKenney
parent 30d89cea5f
commit 41f899f18d
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
kernel/rcu/srcutree.c
View File

@ -1016,10 +1016,10 @@ static void srcu_gp_end(struct srcu_struct *ssp, bool is_atomic)
/* Initiate callback invocation as needed. */
ss_state = smp_load_acquire(&sup->srcu_size_state);
if (ss_state < SRCU_SIZE_WAIT_BARRIER) {
if (!is_atomic && ss_state < SRCU_SIZE_WAIT_BARRIER) {
srcu_schedule_cbs_sdp(per_cpu_ptr(ssp->sda, get_boot_cpu_id()),
cbdelay);
} else {
} else if (!is_atomic) {
idx = rcu_seq_ctr(gpseq) % ARRAY_SIZE(snp->srcu_have_cbs);
srcu_for_each_node_breadth_first(ssp, snp) {
raw_spin_lock_irq_rcu_node(snp);