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malloc: notify primary process about hotplug in secondary

Message ID 20181207200624.372536-1-seth.howell@intel.com (mailing list archive)
State Superseded, archived
Delegated to: Thomas Monjalon
Headers show
Series malloc: notify primary process about hotplug in secondary | expand


Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation success Compilation OK
ci/mellanox-Performance-Testing success Performance Testing PASS
ci/intel-Performance-Testing success Performance Testing PASS

Commit Message

Seth Howell Dec. 7, 2018, 8:06 p.m. UTC
When secondary process hotplugs memory, it sends a request
to primary, which then performs the real mmap() and sends
sync requests to all secondary processes. Upon receiving
such sync request, each secondary process will notify the
upper layers of hotplugged memory (and will call all
locally registered event callbacks).

In the end we'll end up with memory event callbacks fired
in all the processes except the primary, which is a bug.

This gets critical if memory is hotplugged while a VFIO
device is attached, as the VFIO memory registration -
which is done from a memory event callback present in the
primary process only - is never called.

After this patch, a primary process fires memory event
callbacks before secondary processes start their
synchronizations - both for hotplug and hotremove.

Fixes: 07dcbfe0101f ("malloc: support multiprocess memory hotplug")

Signed-off-by: Seth Howell <seth.howell@intel.com>
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
 lib/librte_eal/common/malloc_mp.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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diff --git a/lib/librte_eal/common/malloc_mp.c b/lib/librte_eal/common/malloc_mp.c
index 5f2d4e0be..f3a13353b 100644
--- a/lib/librte_eal/common/malloc_mp.c
+++ b/lib/librte_eal/common/malloc_mp.c
@@ -209,6 +209,8 @@  handle_alloc_request(const struct malloc_mp_req *m,
 	map_addr = ms[0]->addr;
+	eal_memalloc_mem_event_notify(RTE_MEM_EVENT_ALLOC, map_addr, alloc_sz);
 	/* we have succeeded in allocating memory, but we still need to sync
 	 * with other processes. however, since DPDK IPC is single-threaded, we
 	 * send an asynchronous request and exit this callback.
@@ -258,6 +260,9 @@  handle_request(const struct rte_mp_msg *msg, const void *peer __rte_unused)
 	if (m->t == REQ_TYPE_ALLOC) {
 		ret = handle_alloc_request(m, entry);
 	} else if (m->t == REQ_TYPE_FREE) {
+		eal_memalloc_mem_event_notify(RTE_MEM_EVENT_FREE,
+				m->free_req.addr, m->free_req.len);
 		ret = malloc_heap_free_pages(m->free_req.addr,
 	} else {
@@ -436,6 +441,9 @@  handle_sync_response(const struct rte_mp_msg *request,
 		memset(&rb_msg, 0, sizeof(rb_msg));
 		/* we've failed to sync, so do a rollback */
+		eal_memalloc_mem_event_notify(RTE_MEM_EVENT_FREE,
+				state->map_addr, state->map_len);
 		rollback_expand_heap(state->ms, state->ms_len, state->elem,
 				state->map_addr, state->map_len);