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-rw-r--r--src/vppinfra/timing_wheel.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/src/vppinfra/timing_wheel.c b/src/vppinfra/timing_wheel.c
index 4c8a2c583a9..064171ab4e4 100644
--- a/src/vppinfra/timing_wheel.c
+++ b/src/vppinfra/timing_wheel.c
@@ -239,6 +239,8 @@ timing_wheel_insert_helper (timing_wheel_t * w, u64 insert_cpu_time,
e = insert_helper (w, level_index, rtime);
e->user_data = user_data;
e->cpu_time_relative_to_base = dt;
+ if (insert_cpu_time < w->cached_min_cpu_time_on_wheel)
+ w->cached_min_cpu_time_on_wheel = insert_cpu_time;
}
else
{
@@ -488,7 +490,8 @@ advance_cpu_time_base (timing_wheel_t * w, u32 * expired_user_data)
vec_foreach (e, l->elts[wi])
{
/* This should always be true since otherwise we would have already expired
- this element. */
+ this element. Note that in the second half of this function we need
+ to take care not to place the expired elements ourselves. */
ASSERT (e->cpu_time_relative_to_base >= delta);
e->cpu_time_relative_to_base -= delta;
}
@@ -505,10 +508,11 @@ advance_cpu_time_base (timing_wheel_t * w, u32 * expired_user_data)
if (0 == ((oe->cpu_time - w->cpu_time_base) >> BITS (e->cpu_time_relative_to_base)))
{
u64 ti = oe->cpu_time >> w->log2_clocks_per_bin;
- if (ti < w->current_time_index)
+ if (ti <= w->current_time_index)
{
/* This can happen when timing wheel is not advanced for a long time
(for example when at a gdb breakpoint for a while). */
+ /* Note: the ti == w->current_time_index means it is also an expired timer */
if (! elt_is_deleted (w, oe->user_data))
vec_add1 (expired_user_data, oe->user_data);
}
@@ -664,6 +668,8 @@ timing_wheel_advance (timing_wheel_t * w, u64 advance_cpu_time,
expire_bin (w, advance_level_index, wi, advance_cpu_time,
expired_user_data);
+ /* When we jump out, we have already just expired the bin,
+ corresponding to advance_wheel_index */
if (wi == advance_wheel_index)
break;
@@ -682,6 +688,9 @@ timing_wheel_advance (timing_wheel_t * w, u64 advance_cpu_time,
}
/* Don't advance until necessary. */
+ /* However, if the timing_wheel_advance() hasn't been called for some time,
+ the while() loop will ensure multiple calls to advance_cpu_time_base()
+ in a row until the w->cpu_time_base is fresh enough. */
while (PREDICT_FALSE
(advance_time_index >= w->time_index_next_cpu_time_base_update))
expired_user_data = advance_cpu_time_base (w, expired_user_data);