hyperv/vmbus: Use atomic swap and flsl to process event flags
Greatly reduce the locked instructions and reduce number of inner loops. MFC after: 1 week Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D6404
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5002e19502
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632da4eb89
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=300105
@ -332,32 +332,32 @@ hv_vmbus_on_events(int cpu)
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*/
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for (f = 0; f < flag_cnt; f++) {
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uint32_t rel_id_base;
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unsigned long flags;
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int bit;
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if (intr_flags[f] == 0)
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continue;
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flags = atomic_swap_long(&intr_flags[f], 0);
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rel_id_base = f << HV_CHANNEL_ULONG_SHIFT;
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for (bit = 0; bit < HV_CHANNEL_ULONG_LEN; bit++) {
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if (atomic_testandclear_long(&intr_flags[f], bit)) {
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struct hv_vmbus_channel *channel;
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uint32_t rel_id;
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rel_id = rel_id_base + bit;
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channel =
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hv_vmbus_g_connection.channels[rel_id];
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while ((bit = ffsl(flags)) != 0) {
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struct hv_vmbus_channel *channel;
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uint32_t rel_id;
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/* if channel is closed or closing */
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if (channel == NULL || channel->rxq == NULL)
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continue;
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--bit; /* NOTE: ffsl is 1-based */
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flags &= ~(1UL << bit);
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if (channel->batched_reading) {
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hv_ring_buffer_read_begin(
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&channel->inbound);
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}
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taskqueue_enqueue(channel->rxq,
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&channel->channel_task);
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}
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rel_id = rel_id_base + bit;
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channel = hv_vmbus_g_connection.channels[rel_id];
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/* if channel is closed or closing */
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if (channel == NULL || channel->rxq == NULL)
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continue;
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if (channel->batched_reading)
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hv_ring_buffer_read_begin(&channel->inbound);
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taskqueue_enqueue(channel->rxq, &channel->channel_task);
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}
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}
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}
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