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Diffstat (limited to 'src/vppinfra/tw_timer_template.c')
-rw-r--r--src/vppinfra/tw_timer_template.c74
1 files changed, 74 insertions, 0 deletions
diff --git a/src/vppinfra/tw_timer_template.c b/src/vppinfra/tw_timer_template.c
index 9253488ceac..c0a9685aa82 100644
--- a/src/vppinfra/tw_timer_template.c
+++ b/src/vppinfra/tw_timer_template.c
@@ -204,6 +204,11 @@ TW (tw_timer_start) (TWT (tw_timer_wheel) * tw, u32 pool_index, u32 timer_id,
ts = &tw->w[TW_TIMER_RING_FAST][fast_ring_offset];
timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+
+#if TW_FAST_WHEEL_BITMAP
+ tw->fast_slot_bitmap = clib_bitmap_set (tw->fast_slot_bitmap,
+ fast_ring_offset, 1);
+#endif
return t - tw->timers;
}
@@ -251,6 +256,16 @@ void TW (tw_timer_stop) (TWT (tw_timer_wheel) * tw, u32 handle)
{
TWT (tw_timer) * t;
+#if TW_TIMER_ALLOW_DUPLICATE_STOP
+ /*
+ * A vlib process may have its timer expire, and receive
+ * an event before the expiration is processed.
+ * That results in a duplicate tw_timer_stop.
+ */
+ if (pool_is_free_index (tw->timers, handle))
+ return;
+#endif
+
t = pool_elt_at_index (tw->timers, handle);
/* in case of idiotic handle (e.g. passing a listhead index) */
@@ -481,6 +496,11 @@ static inline
{
ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+#if TW_FAST_WHEEL_BITMAP
+ tw->fast_slot_bitmap =
+ clib_bitmap_set (tw->fast_slot_bitmap,
+ t->fast_ring_offset, 1);
+#endif
}
}
}
@@ -523,6 +543,11 @@ static inline
{
ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+#if TW_FAST_WHEEL_BITMAP
+ tw->fast_slot_bitmap =
+ clib_bitmap_set (tw->fast_slot_bitmap,
+ t->fast_ring_offset, 1);
+#endif
}
else /* typical case */
{
@@ -569,6 +594,11 @@ static inline
/* Add to fast ring */
ts = &tw->w[TW_TIMER_RING_FAST][t->fast_ring_offset];
timer_addhead (tw->timers, ts->head_index, t - tw->timers);
+#if TW_FAST_WHEEL_BITMAP
+ tw->fast_slot_bitmap =
+ clib_bitmap_set (tw->fast_slot_bitmap,
+ t->fast_ring_offset, 1);
+#endif
}
}
}
@@ -604,6 +634,12 @@ static inline
}
tw->expired_timer_handles = callback_vector;
}
+
+#if TW_FAST_WHEEL_BITMAP
+ tw->fast_slot_bitmap = clib_bitmap_set (tw->fast_slot_bitmap,
+ fast_wheel_index, 0);
+#endif
+
tw->current_tick++;
fast_wheel_index++;
tw->current_index[TW_TIMER_RING_FAST] = fast_wheel_index;
@@ -642,6 +678,44 @@ u32 *TW (tw_timer_expire_timers_vec) (TWT (tw_timer_wheel) * tw, f64 now,
return TW (tw_timer_expire_timers_internal) (tw, now, vec);
}
+#if TW_FAST_WHEEL_BITMAP
+/** Returns an approximation to the first timer expiration in
+ * timer-ticks from "now". To avoid wasting an unjustifiable
+ * amount of time on the problem, we maintain an approximate fast-wheel slot
+ * occupancy bitmap. We don't worry about clearing fast wheel bits
+ * when timers are removed from fast wheel slots.
+ */
+
+u32 TW (tw_timer_first_expires_in_ticks) (TWT (tw_timer_wheel) * tw)
+{
+ u32 first_expiring_index, fast_ring_index;
+ i32 delta;
+
+ if (clib_bitmap_is_zero (tw->fast_slot_bitmap))
+ return TW_SLOTS_PER_RING;
+
+ fast_ring_index = tw->current_index[TW_TIMER_RING_FAST];
+ if (fast_ring_index == TW_SLOTS_PER_RING)
+ fast_ring_index = 0;
+
+ first_expiring_index = clib_bitmap_next_set (tw->fast_slot_bitmap,
+ fast_ring_index);
+ if (first_expiring_index == ~0 && fast_ring_index != 0)
+ first_expiring_index = clib_bitmap_first_set (tw->fast_slot_bitmap);
+
+ ASSERT (first_expiring_index != ~0);
+
+ delta = (i32) first_expiring_index - (i32) fast_ring_index;
+ if (delta < 0)
+ delta += TW_SLOTS_PER_RING;
+
+ ASSERT (delta >= 0);
+
+ return (u32) delta;
+}
+
+#endif
+
/*
* fd.io coding-style-patch-verification: ON
*