[dpdk-dev] [RFC v2 08/23] eal: add "single file segments" command-line option

[Anatoly Burakov <anatoly.burakov@intel.com>]

For now, this option does nothing, but it will be useful in
dynamic memory allocation down the line. Currently, DPDK stores
all pages as separate files in hugetlbfs. This option will allow
storing all pages in one file (one file per socket, per page size).

Signed-off-by: Anatoly Burakov <anatoly.burakov@intel.com>
---
 lib/librte_eal/common/eal_common_options.c | 4 ++++
 lib/librte_eal/common/eal_internal_cfg.h   | 3 +++
 lib/librte_eal/common/eal_options.h        | 2 ++
 lib/librte_eal/linuxapp/eal/eal.c          | 1 +
 4 files changed, 10 insertions(+)

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 996a034..c3f7c41 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -98,6 +98,7 @@ eal_long_options[] = {
 	{OPT_VDEV,              1, NULL, OPT_VDEV_NUM             },
 	{OPT_VFIO_INTR,         1, NULL, OPT_VFIO_INTR_NUM        },
 	{OPT_VMWARE_TSC_MAP,    0, NULL, OPT_VMWARE_TSC_MAP_NUM   },
+	{OPT_SINGLE_FILE_SEGMENTS, 0, NULL, OPT_SINGLE_FILE_SEGMENTS_NUM},
 	{0,                     0, NULL, 0                        }
 };
 
@@ -1158,6 +1159,9 @@ eal_parse_common_option(int opt, const char *optarg,
 		}
 		core_parsed = 1;
 		break;
+	case OPT_SINGLE_FILE_SEGMENTS_NUM:
+		conf->single_file_segments = 1;
+		break;
 
 	/* don't know what to do, leave this to caller */
 	default:
diff --git a/lib/librte_eal/common/eal_internal_cfg.h b/lib/librte_eal/common/eal_internal_cfg.h
index fa6ccbe..484a32e 100644
--- a/lib/librte_eal/common/eal_internal_cfg.h
+++ b/lib/librte_eal/common/eal_internal_cfg.h
@@ -76,6 +76,9 @@ struct internal_config {
 	volatile unsigned force_sockets;
 	volatile uint64_t socket_mem[RTE_MAX_NUMA_NODES]; /**< amount of memory per socket */
 	uintptr_t base_virtaddr;          /**< base address to try and reserve memory from */
+	volatile unsigned single_file_segments;
+	/**< true if storing all pages within single files (per-page-size,
+	 * per-node). */
 	volatile int syslog_facility;	  /**< facility passed to openlog() */
 	/** default interrupt mode for VFIO */
 	volatile enum rte_intr_mode vfio_intr_mode;
diff --git a/lib/librte_eal/common/eal_options.h b/lib/librte_eal/common/eal_options.h
index 30e6bb4..26a682a 100644
--- a/lib/librte_eal/common/eal_options.h
+++ b/lib/librte_eal/common/eal_options.h
@@ -83,6 +83,8 @@ enum {
 	OPT_VFIO_INTR_NUM,
 #define OPT_VMWARE_TSC_MAP    "vmware-tsc-map"
 	OPT_VMWARE_TSC_MAP_NUM,
+#define OPT_SINGLE_FILE_SEGMENTS    "single-file-segments"
+	OPT_SINGLE_FILE_SEGMENTS_NUM,
 	OPT_LONG_MAX_NUM
 };
 
diff --git a/lib/librte_eal/linuxapp/eal/eal.c b/lib/librte_eal/linuxapp/eal/eal.c
index 229eec9..2a3127f 100644
--- a/lib/librte_eal/linuxapp/eal/eal.c
+++ b/lib/librte_eal/linuxapp/eal/eal.c
@@ -366,6 +366,7 @@ eal_usage(const char *prgname)
 	       "  --"OPT_BASE_VIRTADDR"     Base virtual address\n"
 	       "  --"OPT_CREATE_UIO_DEV"    Create /dev/uioX (usually done by hotplug)\n"
 	       "  --"OPT_VFIO_INTR"         Interrupt mode for VFIO (legacy|msi|msix)\n"
+	       "  --"OPT_SINGLE_FILE_SEGMENTS" Put all hugepage memory in single files\n"
 	       "\n");
 	/* Allow the application to print its usage message too if hook is set */
 	if ( rte_application_usage_hook ) {
-- 
2.7.4