[dpdk-dev] [PATCH v2] support free hugepages

[linhaifeng]

rte_eal_hugepage_free() is used for unlink all hugepages.If you want to
free all hugepages you must make sure that you have stop to use it,and you
must call this function before exit process.

Signed-off-by: linhaifeng <haifeng.lin at huawei.com>
---
 .../lib/librte_eal/common/include/rte_memory.h     | 11 ++++++++
 .../lib/librte_eal/linuxapp/eal/eal_memory.c       | 31 ++++++++++++++++++++++
 2 files changed, 42 insertions(+)

diff --git a/dpdk/dpdk-1.7.0/lib/librte_eal/common/include/rte_memory.h b/dpdk/dpdk-1.7.0/lib/librte_eal/common/include/rte_memory.h
index 4cf8ea9..f6ad95f 100644
--- a/dpdk/dpdk-1.7.0/lib/librte_eal/common/include/rte_memory.h
+++ b/dpdk/dpdk-1.7.0/lib/librte_eal/common/include/rte_memory.h
@@ -172,6 +172,17 @@ unsigned rte_memory_get_nchannel(void);
  */
 unsigned rte_memory_get_nrank(void);
 
+/**
+ * Unlink all hugepages which created by dpdk.
+ *
+ * @param void
+ *
+ * @return
+ *       0: successfully
+ *       negative: error
+ */
+int rte_eal_hugepage_free(void);
+
 #ifdef RTE_LIBRTE_XEN_DOM0
 /**
  * Return the physical address of elt, which is an element of the pool mp.
diff --git a/dpdk/dpdk-1.7.0/lib/librte_eal/linuxapp/eal/eal_memory.c b/dpdk/dpdk-1.7.0/lib/librte_eal/linuxapp/eal/eal_memory.c
index f2454f4..109207c 100644
--- a/dpdk/dpdk-1.7.0/lib/librte_eal/linuxapp/eal/eal_memory.c
+++ b/dpdk/dpdk-1.7.0/lib/librte_eal/linuxapp/eal/eal_memory.c
@@ -98,6 +98,13 @@
 #include "eal_filesystem.h"
 #include "eal_hugepages.h"
 
+struct hugepage_table {
+	struct hugepage_file *hugepg_tbl;
+	unsigned nr_hugefiles;
+};
+
+static struct hugepage_table g_hugepage_table;
+
 /**
  * @file
  * Huge page mapping under linux
@@ -1202,6 +1209,7 @@ rte_eal_hugepage_init(void)
 						(unsigned)
 							(used_hp[i].hugepage_sz / 0x100000),
 						j);
+				g_hugepage_table.nr_hugefiles += used_hp[i].num_pages[j];
 			}
 		}
 	}
@@ -1237,6 +1245,8 @@ rte_eal_hugepage_init(void)
 		goto fail;
 	}
 
+	g_hugepage_table.hugepg_tbl = hugepage;
+
 	/* free the temporary hugepage table */
 	free(tmp_hp);
 	tmp_hp = NULL;
@@ -1487,6 +1497,27 @@ error:
 	return -1;
 }
 
+int
+rte_eal_hugepage_free(void)
+{
+	struct hugepage_file *hugepg_tbl = g_hugepage_table.hugepg_tbl;
+	unsigned i;
+	unsigned nr_hugefiles = g_hugepage_table.nr_hugefiles;
+	int ret = 0;
+
+	for (i = 0; i < nr_hugefiles; i++) {
+		ret = unlink(hugepg_tbl[i].filepath);
+		if (ret != 0) {
+			RTE_LOG(ERR, EAL, "Failed to unlink %s", hugepg_tbl[i].filepath);
+			return ret;
+		}
+		hugepg_tbl[i].orig_va = NULL;
+	}
+
+	RTE_LOG(INFO, EAL, "unlink %u hugepage files\n", nr_hugefiles);
+	return ret;
+}
+
 static int
 rte_eal_memdevice_init(void)
 {
-- 
1.8.3.1