From: Yulei Zhang <yuleixzh...@tencent.com>
Create 'dmem' directory under debugfs and show some
statistic for dmem pool, track total and free dpages
on dmem pool and each numa node.
Signed-off-by: Xiao Guangrong <gloryx...@tencent.com>
Signed-off-by: Yulei Zhang <yuleixzh...@tencent.com>
---
mm/Kconfig | 9 +++++
mm/dmem.c | 100 ++++++++++++++++++++++++++++++++++++++++++++++++++++-
2 files changed, 108 insertions(+), 1 deletion(-)
diff --git a/mm/Kconfig b/mm/Kconfig
index e1995da11cea..8a67c8933a42 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -235,6 +235,15 @@ config DMEM
Allow reservation of memory which could be dedicated usage of dmem.
It's the basics of dmemfs.
+config DMEM_DEBUG_FS
+ bool "Enable debug information for direct memory"
+ depends on DMEM && DEBUG_FS
+ def_bool n
+ help
+ This option enables showing various statistics of direct memory
+ in debugfs filesystem.
+
+#
# support for memory compaction
config COMPACTION
bool "Allow for memory compaction"
diff --git a/mm/dmem.c b/mm/dmem.c
index aa34bf20f830..6992e57d5df0 100644
--- a/mm/dmem.c
+++ b/mm/dmem.c
@@ -164,6 +164,103 @@ int dmem_region_register(int node, phys_addr_t start,
phys_addr_t end)
return 0;
}
+#ifdef CONFIG_DMEM_DEBUG_FS
+struct debugfs_entry {
+ const char *name;
+ unsigned long offset;
+};
+
+#define DMEM_POOL_OFFSET(x) offsetof(struct dmem_pool, x)
+#define DMEM_POOL_ENTRY(x) {__stringify(x), DMEM_POOL_OFFSET(x)}
+
+#define DMEM_NODE_OFFSET(x) offsetof(struct dmem_node, x)
+#define DMEM_NODE_ENTRY(x) {__stringify(x), DMEM_NODE_OFFSET(x)}
+
+static struct debugfs_entry dmem_pool_entries[] = {
+ DMEM_POOL_ENTRY(region_num),
+ DMEM_POOL_ENTRY(registered_pages),
+ DMEM_POOL_ENTRY(unaligned_pages),
+ DMEM_POOL_ENTRY(dpage_shift),
+ DMEM_POOL_ENTRY(total_dpages),
+ DMEM_POOL_ENTRY(free_dpages),
+};
+
+static struct debugfs_entry dmem_node_entries[] = {
+ DMEM_NODE_ENTRY(total_dpages),
+ DMEM_NODE_ENTRY(free_dpages),
+};
+
+static int dmem_entry_get(void *offset, u64 *val)
+{
+ *val = *(u64 *)offset;
+ return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(dmem_fops, dmem_entry_get, NULL, "%llu\n");
+
+static int dmemfs_init_debugfs_node(struct dmem_node *dnode,
+ struct dentry *parent)
+{
+ struct dentry *node_dir;
+ char dir_name[32];
+ int i, ret = -EEXIST;
+
+ snprintf(dir_name, sizeof(dir_name), "node%ld",
+ dnode - dmem_pool.nodes);
+ node_dir = debugfs_create_dir(dir_name, parent);
+ if (!node_dir)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(dmem_node_entries); i++)
+ if (!debugfs_create_file(dmem_node_entries[i].name, 0444,
+ node_dir, (void *)dnode + dmem_node_entries[i].offset,
+ &dmem_fops))
+ return ret;
+ return 0;
+}
+
+static int dmemfs_init_debugfs(void)
+{
+ struct dentry *dmem_debugfs_dir;
+ struct dmem_node *dnode;
+ int i, ret = -EEXIST;
+
+ dmem_debugfs_dir = debugfs_create_dir("dmem", NULL);
+ if (!dmem_debugfs_dir)
+ return ret;
+
+ for (i = 0; i < ARRAY_SIZE(dmem_pool_entries); i++)
+ if (!debugfs_create_file(dmem_pool_entries[i].name, 0444,
+ dmem_debugfs_dir,
+ (void *)&dmem_pool + dmem_pool_entries[i].offset,
+ &dmem_fops))
+ goto exit;
+
+ for_each_dmem_node(dnode) {
+ /*
+ * do not create debugfs files for the node
+ * where no memory is available
+ */
+ if (list_empty(&dnode->regions))
+ continue;
+
+ if (dmemfs_init_debugfs_node(dnode, dmem_debugfs_dir))
+ goto exit;
+ }
+
+ return 0;
+exit:
+ debugfs_remove_recursive(dmem_debugfs_dir);
+ return ret;
+}
+
+#else
+static int dmemfs_init_debugfs(void)
+{
+ return 0;
+}
+#endif
+
#define PENALTY_FOR_DMEM_SHARED_NODE (1)
static int dmem_nodeload[MAX_NUMNODES] __initdata;
@@ -364,7 +461,8 @@ static int __init dmem_late_init(void)
goto exit;
}
}
- return ret;
+
+ return dmemfs_init_debugfs();
exit:
dmem_uinit();
return ret;
--
2.28.0
