From: Anatoly Burakov <anatoly.burakov@intel.com>
Date: Wed, 11 Apr 2018 12:30:32 +0000 (+0100)
Subject: mem: make use of memory hotplug for init
X-Git-Url: http://git.droids-corp.org/?a=commitdiff_plain;h=41519b9006a737629503f4ed422fcb1c9188e02e;p=dpdk.git

mem: make use of memory hotplug for init

Add a new (non-legacy) memory init path for EAL. It uses the
new memory hotplug facilities.

If no -m or --socket-mem switches were specified, the new init
will not allocate anything, whereas if those switches were passed,
appropriate amounts of pages would be requested, just like for
legacy init.

Allocated pages will be physically discontiguous (or rather, they're
not guaranteed to be physically contiguous - they may still be so by
accident) unless RTE_IOVA_VA mode is used.

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
Tested-by: Santosh Shukla <santosh.shukla@caviumnetworks.com>
Tested-by: Hemant Agrawal <hemant.agrawal@nxp.com>
Tested-by: Gowrishankar Muthukrishnan <gowrishankar.m@linux.vnet.ibm.com>
---

diff --git a/lib/librte_eal/linuxapp/eal/eal_memory.c b/lib/librte_eal/linuxapp/eal/eal_memory.c
index daab36490d..c68db32f17 100644
--- a/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -40,6 +40,7 @@
 #include <rte_string_fns.h>
 
 #include "eal_private.h"
+#include "eal_memalloc.h"
 #include "eal_internal_cfg.h"
 #include "eal_filesystem.h"
 #include "eal_hugepages.h"
@@ -1601,6 +1602,61 @@ fail:
 	return -1;
 }
 
+static int
+eal_hugepage_init(void)
+{
+	struct hugepage_info used_hp[MAX_HUGEPAGE_SIZES];
+	uint64_t memory[RTE_MAX_NUMA_NODES];
+	int hp_sz_idx, socket_id;
+
+	test_phys_addrs_available();
+
+	memset(used_hp, 0, sizeof(used_hp));
+
+	for (hp_sz_idx = 0;
+			hp_sz_idx < (int) internal_config.num_hugepage_sizes;
+			hp_sz_idx++) {
+		/* also initialize used_hp hugepage sizes in used_hp */
+		struct hugepage_info *hpi;
+		hpi = &internal_config.hugepage_info[hp_sz_idx];
+		used_hp[hp_sz_idx].hugepage_sz = hpi->hugepage_sz;
+	}
+
+	/* make a copy of socket_mem, needed for balanced allocation. */
+	for (hp_sz_idx = 0; hp_sz_idx < RTE_MAX_NUMA_NODES; hp_sz_idx++)
+		memory[hp_sz_idx] = internal_config.socket_mem[hp_sz_idx];
+
+	/* calculate final number of pages */
+	if (calc_num_pages_per_socket(memory,
+			internal_config.hugepage_info, used_hp,
+			internal_config.num_hugepage_sizes) < 0)
+		return -1;
+
+	for (hp_sz_idx = 0;
+			hp_sz_idx < (int)internal_config.num_hugepage_sizes;
+			hp_sz_idx++) {
+		for (socket_id = 0; socket_id < RTE_MAX_NUMA_NODES;
+				socket_id++) {
+			struct hugepage_info *hpi = &used_hp[hp_sz_idx];
+			unsigned int num_pages = hpi->num_pages[socket_id];
+			int num_pages_alloc;
+
+			if (num_pages == 0)
+				continue;
+
+			RTE_LOG(DEBUG, EAL, "Allocating %u pages of size %" PRIu64 "M on socket %i\n",
+				num_pages, hpi->hugepage_sz >> 20, socket_id);
+
+			num_pages_alloc = eal_memalloc_alloc_seg_bulk(NULL,
+					num_pages, hpi->hugepage_sz,
+					socket_id, true);
+			if (num_pages_alloc < 0)
+				return -1;
+		}
+	}
+	return 0;
+}
+
 /*
  * uses fstat to report the size of a file on disk
  */
@@ -1723,9 +1779,9 @@ error:
 int
 rte_eal_hugepage_init(void)
 {
-	if (internal_config.legacy_mem)
-		return eal_legacy_hugepage_init();
-	return -1;
+	return internal_config.legacy_mem ?
+			eal_legacy_hugepage_init() :
+			eal_hugepage_init();
 }
 
 int