[PATCH 8/9] dm: core: Add a command to show driver model statistics
Simon Glass
sjg at chromium.org
Sun May 8 12:39:26 CEST 2022
This command shows the memory used by driver model along with various
hints as to what it might be if some 'core' tags were moved to use the
tag list instead of a core (i.e. always-there) pointer.
This may help with future work to reduce memory usage.
Signed-off-by: Simon Glass <sjg at chromium.org>
---
cmd/dm.c | 23 ++++++++++++++
drivers/core/Kconfig | 11 +++++++
drivers/core/dump.c | 73 ++++++++++++++++++++++++++++++++++++++++++++
drivers/core/tag.c | 18 +++++++++++
include/dm/root.h | 2 +-
include/dm/tag.h | 8 +++++
include/dm/util.h | 9 ++++++
7 files changed, 143 insertions(+), 1 deletion(-)
diff --git a/cmd/dm.c b/cmd/dm.c
index 4c0a8a53ced..3814dcd20f1 100644
--- a/cmd/dm.c
+++ b/cmd/dm.c
@@ -40,6 +40,19 @@ static int do_dm_dump_drivers(struct cmd_tbl *cmdtp, int flag, int argc,
return 0;
}
+#if CONFIG_IS_ENABLED(DM_STATS)
+static int do_dm_dump_mem(struct cmd_tbl *cmdtp, int flag, int argc,
+ char *const argv[])
+{
+ struct dm_stats mem;
+
+ dm_get_mem(&mem);
+ dm_dump_mem(&mem);
+
+ return 0;
+}
+#endif /* DM_STATS */
+
static int do_dm_dump_static_driver_info(struct cmd_tbl *cmdtp, int flag,
int argc, char * const argv[])
{
@@ -68,6 +81,9 @@ static struct cmd_tbl test_commands[] = {
U_BOOT_CMD_MKENT(compat, 1, 1, do_dm_dump_driver_compat, "", ""),
U_BOOT_CMD_MKENT(devres, 1, 1, do_dm_dump_devres, "", ""),
U_BOOT_CMD_MKENT(drivers, 1, 1, do_dm_dump_drivers, "", ""),
+#if CONFIG_IS_ENABLED(DM_STATS)
+ U_BOOT_CMD_MKENT(mem, 1, 1, do_dm_dump_mem, "", ""),
+#endif
U_BOOT_CMD_MKENT(static, 1, 1, do_dm_dump_static_driver_info, "", ""),
U_BOOT_CMD_MKENT(tree, 0, 1, do_dm_dump_tree, "", ""),
U_BOOT_CMD_MKENT(uclass, 1, 1, do_dm_dump_uclass, "", ""),
@@ -106,12 +122,19 @@ static int do_dm(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
return cmd_process_error(test_cmd, ret);
}
+#if CONFIG_IS_ENABLED(DM_STATS)
+#define DM_MEM_HELP "dm mem Provide a summary of memory usage\n"
+#else
+#define DM_MEM_HELP
+#endif
+
U_BOOT_CMD(
dm, 3, 1, do_dm,
"Driver model low level access",
"compat Dump list of drivers with compatibility strings\n"
"dm devres Dump list of device resources for each device\n"
"dm drivers Dump list of drivers with uclass and instances\n"
+ DM_MEM_HELP
"dm static Dump list of drivers with static platform data\n"
"dm tree Dump tree of driver model devices ('*' = activated)\n"
"dm uclass Dump list of instances for each uclass"
diff --git a/drivers/core/Kconfig b/drivers/core/Kconfig
index 408a8d8e28b..fa2811af83c 100644
--- a/drivers/core/Kconfig
+++ b/drivers/core/Kconfig
@@ -75,6 +75,17 @@ config DM_DEBUG
help
Say Y here if you want to compile in debug messages in DM core.
+config DM_STATS
+ bool "Collect and show driver model stats"
+ depends on DM
+ default y if SANDBOX
+ help
+ Enable this to collect and display memory statistics about driver
+ model. This can help to figure out where all the memory is going and
+ to find optimisations.
+
+ To display the memory stats, use the 'dm mem' command.
+
config DM_DEVICE_REMOVE
bool "Support device removal"
depends on DM
diff --git a/drivers/core/dump.c b/drivers/core/dump.c
index ce679e26290..43d1349635b 100644
--- a/drivers/core/dump.c
+++ b/drivers/core/dump.c
@@ -174,3 +174,76 @@ void dm_dump_static_driver_info(void)
for (entry = drv; entry != drv + n_ents; entry++)
printf("%-25.25s %p\n", entry->name, entry->plat);
}
+
+void dm_dump_mem(struct dm_stats *stats)
+{
+ int total, total_delta;
+ int i;
+
+ /* Support SPL printf() */
+ printf("Struct sizes: udevice %x, driver %x, uclass %x, uc_driver %x\n",
+ (int)sizeof(struct udevice), (int)sizeof(struct driver),
+ (int)sizeof(struct uclass), (int)sizeof(struct uclass_driver));
+ printf("Memory: device %x:%x, device names %x, uclass %x:%x\n",
+ stats->dev_count, stats->dev_size, stats->dev_name_size,
+ stats->uc_count, stats->uc_size);
+ printf("\n");
+ printf("%-15s %5s %5s %5s %5s %5s\n", "Attached type", "Count",
+ "Size", "Cur", "Tags", "Save");
+ printf("%-15s %5s %5s %5s %5s %5s\n", "---------------", "-----",
+ "-----", "-----", "-----", "-----");
+ total_delta = 0;
+ for (i = 0; i < DM_TAG_ATTACH_COUNT; i++) {
+ int cur_size, new_size, delta;
+
+ cur_size = stats->dev_count * sizeof(struct udevice);
+ new_size = stats->dev_count * (sizeof(struct udevice) -
+ sizeof(void *));
+ /*
+ * Let's assume we can fit each dmtag_node into 32 bits. We can
+ * limit the 'tiny tags' feature to SPL with
+ * CONFIG_SPL_SYS_MALLOC_F_LEN <= 64KB, so needing 14 bits to
+ * point to anything in that region (with 4-byte alignment).
+ * So:
+ * 4 bits for tag
+ * 14 bits for offset of dev
+ * 14 bits for offset of data
+ */
+ new_size += stats->attach_count[i] * sizeof(u32);
+ delta = cur_size - new_size;
+ total_delta += delta;
+ printf("%-16s %5x %6x %6x %6x %6x (%d)\n", tag_get_name(i),
+ stats->attach_count[i], stats->attach_size[i],
+ cur_size, new_size, delta > 0 ? delta : 0, delta);
+ }
+ printf("%-16s %5x %6x\n", "uclass", stats->uc_attach_count,
+ stats->uc_attach_size);
+ printf("%-16s %5x %6x %5s %5s %6x (%d)\n", "Attached total",
+ stats->attach_count_total + stats->uc_attach_count,
+ stats->attach_size_total + stats->uc_attach_size, "", "",
+ total_delta > 0 ? total_delta : 0, total_delta);
+ printf("%-16s %5x %6x\n", "tags", stats->tag_count, stats->tag_size);
+ printf("\n");
+ printf("Total size: %x (%d)\n", stats->total_size, stats->total_size);
+ printf("\n");
+
+ total = stats->total_size;
+ total -= total_delta;
+ printf("With tags: %x (%d)\n", total, total);
+
+ /* Use singly linked lists in struct udevice (3 nodes in each) */
+ total -= sizeof(void *) * 3 * stats->dev_count;
+ printf("- singly-linked: %x (%d)\n", total, total);
+
+ /* Use an index into the struct_driver list instead of a pointer */
+ total = total + stats->dev_count * (1 - sizeof(void *));
+ printf("- driver index: %x (%d)\n", total, total);
+
+ /* Same with the uclass */
+ total = total + stats->dev_count * (1 - sizeof(void *));
+ printf("- uclass index: %x (%d)\n", total, total);
+
+ /* Drop the device name */
+ printf("Drop device name (not SRAM): %x (%d)\n", stats->dev_name_size,
+ stats->dev_name_size);
+}
diff --git a/drivers/core/tag.c b/drivers/core/tag.c
index 2961725b658..a3c5cb7e57c 100644
--- a/drivers/core/tag.c
+++ b/drivers/core/tag.c
@@ -16,6 +16,24 @@ struct udevice;
DECLARE_GLOBAL_DATA_PTR;
+static const char *const tag_name[] = {
+ [DM_TAG_PLAT] = "plat",
+ [DM_TAG_PARENT_PLAT] = "parent_plat",
+ [DM_TAG_UC_PLAT] = "uclass_plat",
+
+ [DM_TAG_PRIV] = "priv",
+ [DM_TAG_PARENT_PRIV] = "parent_priv",
+ [DM_TAG_UC_PRIV] = "uclass_priv",
+ [DM_TAG_DRIVER_DATA] = "driver_data",
+
+ [DM_TAG_EFI] = "efi",
+};
+
+const char *tag_get_name(enum dm_tag_t tag)
+{
+ return tag_name[tag];
+}
+
int dev_tag_set_ptr(struct udevice *dev, enum dm_tag_t tag, void *ptr)
{
struct dmtag_node *node;
diff --git a/include/dm/root.h b/include/dm/root.h
index 382f83c7f5b..b2f30a842f5 100644
--- a/include/dm/root.h
+++ b/include/dm/root.h
@@ -182,7 +182,7 @@ void dm_get_stats(int *device_countp, int *uclass_countp);
/**
* dm_get_mem() - Get stats on memory usage in driver model
*
- * @mem: Place to put the information
+ * @stats: Place to put the information
*/
void dm_get_mem(struct dm_stats *stats);
diff --git a/include/dm/tag.h b/include/dm/tag.h
index 1ea3c9f7af3..745088ffcff 100644
--- a/include/dm/tag.h
+++ b/include/dm/tag.h
@@ -129,4 +129,12 @@ int dev_tag_del_all(struct udevice *dev);
*/
void dev_tag_collect_stats(struct dm_stats *stats);
+/**
+ * tag_get_name() - Get the name of a tag
+ *
+ * @tag: Tag to look up, which must be valid
+ * Returns: Name of tag
+ */
+const char *tag_get_name(enum dm_tag_t tag);
+
#endif /* _DM_TAG_H */
diff --git a/include/dm/util.h b/include/dm/util.h
index c52daa87ef3..e10c6060ce0 100644
--- a/include/dm/util.h
+++ b/include/dm/util.h
@@ -6,6 +6,8 @@
#ifndef __DM_UTIL_H
#define __DM_UTIL_H
+struct dm_stats;
+
#if CONFIG_IS_ENABLED(DM_WARN)
#define dm_warn(fmt...) log(LOGC_DM, LOGL_WARNING, ##fmt)
#else
@@ -48,6 +50,13 @@ void dm_dump_driver_compat(void);
/* Dump out a list of drivers with static platform data */
void dm_dump_static_driver_info(void);
+/**
+ * dm_dump_mem() - Dump stats on memory usage in driver model
+ *
+ * @mem: Stats to dump
+ */
+void dm_dump_mem(struct dm_stats *stats);
+
#if CONFIG_IS_ENABLED(OF_PLATDATA_INST) && CONFIG_IS_ENABLED(READ_ONLY)
void *dm_priv_to_rw(void *priv);
#else
--
2.36.0.512.ge40c2bad7a-goog
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