diff mbox series

[v8,1/5] lib/stackdepot: Move stack_record struct definition into the header

Message ID 20240212223029.30769-2-osalvador@suse.de
State New
Headers
Series page_owner: print stacks and their outstanding allocations |

Commit Message

Oscar Salvador Feb. 12, 2024, 10:30 p.m. UTC 
  In order to move the heavy lifting into page_owner code, this one
needs to have access to the stack_record structure, which right now
sits in lib/stackdepot.c.
Move it to the stackdepot.h header so page_owner can access
stack_record's struct fields.

Signed-off-by: Oscar Salvador <osalvador@suse.de>
---
 include/linux/stackdepot.h | 44 ++++++++++++++++++++++++++++++++++++++
 lib/stackdepot.c           | 43 -------------------------------------
 2 files changed, 44 insertions(+), 43 deletions(-)

Comments

Marco Elver Feb. 13, 2024, 8:26 a.m. UTC | #1 
On Mon, 12 Feb 2024 at 23:29, Oscar Salvador <osalvador@suse.de> wrote:
>
> In order to move the heavy lifting into page_owner code, this one
> needs to have access to the stack_record structure, which right now
> sits in lib/stackdepot.c.
> Move it to the stackdepot.h header so page_owner can access
> stack_record's struct fields.
>
> Signed-off-by: Oscar Salvador <osalvador@suse.de>

Reviewed-by: Marco Elver <elver@google.com>

> ---
>  include/linux/stackdepot.h | 44 ++++++++++++++++++++++++++++++++++++++
>  lib/stackdepot.c           | 43 -------------------------------------
>  2 files changed, 44 insertions(+), 43 deletions(-)
>
> diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
> index adcbb8f23600..90274860fd8e 100644
> --- a/include/linux/stackdepot.h
> +++ b/include/linux/stackdepot.h
> @@ -30,6 +30,50 @@ typedef u32 depot_stack_handle_t;
>   */
>  #define STACK_DEPOT_EXTRA_BITS 5
>
> +#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8)
> +
> +#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
> +#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER))
> +#define DEPOT_STACK_ALIGN 4
> +#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALIGN)
> +#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
> +                              STACK_DEPOT_EXTRA_BITS)
> +
> +/* Compact structure that stores a reference to a stack. */
> +union handle_parts {
> +       depot_stack_handle_t handle;
> +       struct {
> +               u32 pool_index  : DEPOT_POOL_INDEX_BITS;
> +               u32 offset      : DEPOT_OFFSET_BITS;
> +               u32 extra       : STACK_DEPOT_EXTRA_BITS;
> +       };
> +};
> +
> +struct stack_record {
> +       struct list_head hash_list;     /* Links in the hash table */
> +       u32 hash;                       /* Hash in hash table */
> +       u32 size;                       /* Number of stored frames */
> +       union handle_parts handle;      /* Constant after initialization */
> +       refcount_t count;
> +       union {
> +               unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES];    /* Frames */
> +               struct {
> +                       /*
> +                        * An important invariant of the implementation is to
> +                        * only place a stack record onto the freelist iff its
> +                        * refcount is zero. Because stack records with a zero
> +                        * refcount are never considered as valid, it is safe to
> +                        * union @entries and freelist management state below.
> +                        * Conversely, as soon as an entry is off the freelist
> +                        * and its refcount becomes non-zero, the below must not
> +                        * be accessed until being placed back on the freelist.
> +                        */
> +                       struct list_head free_list;     /* Links in the freelist */
> +                       unsigned long rcu_state;        /* RCU cookie */
> +               };
> +       };
> +};
> +
>  typedef u32 depot_flags_t;
>
>  /*
> diff --git a/lib/stackdepot.c b/lib/stackdepot.c
> index 4a7055a63d9f..6f9095374847 100644
> --- a/lib/stackdepot.c
> +++ b/lib/stackdepot.c
> @@ -36,54 +36,11 @@
>  #include <linux/memblock.h>
>  #include <linux/kasan-enabled.h>
>
> -#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8)
> -
> -#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
> -#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER))
> -#define DEPOT_STACK_ALIGN 4
> -#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALIGN)
> -#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
> -                              STACK_DEPOT_EXTRA_BITS)
>  #define DEPOT_POOLS_CAP 8192
>  #define DEPOT_MAX_POOLS \
>         (((1LL << (DEPOT_POOL_INDEX_BITS)) < DEPOT_POOLS_CAP) ? \
>          (1LL << (DEPOT_POOL_INDEX_BITS)) : DEPOT_POOLS_CAP)
>
> -/* Compact structure that stores a reference to a stack. */
> -union handle_parts {
> -       depot_stack_handle_t handle;
> -       struct {
> -               u32 pool_index  : DEPOT_POOL_INDEX_BITS;
> -               u32 offset      : DEPOT_OFFSET_BITS;
> -               u32 extra       : STACK_DEPOT_EXTRA_BITS;
> -       };
> -};
> -
> -struct stack_record {
> -       struct list_head hash_list;     /* Links in the hash table */
> -       u32 hash;                       /* Hash in hash table */
> -       u32 size;                       /* Number of stored frames */
> -       union handle_parts handle;      /* Constant after initialization */
> -       refcount_t count;
> -       union {
> -               unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES];    /* Frames */
> -               struct {
> -                       /*
> -                        * An important invariant of the implementation is to
> -                        * only place a stack record onto the freelist iff its
> -                        * refcount is zero. Because stack records with a zero
> -                        * refcount are never considered as valid, it is safe to
> -                        * union @entries and freelist management state below.
> -                        * Conversely, as soon as an entry is off the freelist
> -                        * and its refcount becomes non-zero, the below must not
> -                        * be accessed until being placed back on the freelist.
> -                        */
> -                       struct list_head free_list;     /* Links in the freelist */
> -                       unsigned long rcu_state;        /* RCU cookie */
> -               };
> -       };
> -};
> -
>  static bool stack_depot_disabled;
>  static bool __stack_depot_early_init_requested __initdata = IS_ENABLED(CONFIG_STACKDEPOT_ALWAYS_INIT);
>  static bool __stack_depot_early_init_passed __initdata;
> --
> 2.43.0
>
Vlastimil Babka Feb. 13, 2024, 11:12 a.m. UTC | #2 
On 2/12/24 23:30, Oscar Salvador wrote:
> In order to move the heavy lifting into page_owner code, this one
> needs to have access to the stack_record structure, which right now
> sits in lib/stackdepot.c.
> Move it to the stackdepot.h header so page_owner can access
> stack_record's struct fields.
> 
> Signed-off-by: Oscar Salvador <osalvador@suse.de>

Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
diff mbox series

Patch

diff --git a/include/linux/stackdepot.h b/include/linux/stackdepot.h
index adcbb8f23600..90274860fd8e 100644
--- a/include/linux/stackdepot.h
+++ b/include/linux/stackdepot.h
@@ -30,6 +30,50 @@  typedef u32 depot_stack_handle_t;
  */
 #define STACK_DEPOT_EXTRA_BITS 5
 
+#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8)
+
+#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
+#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER))
+#define DEPOT_STACK_ALIGN 4
+#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALIGN)
+#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
+			       STACK_DEPOT_EXTRA_BITS)
+
+/* Compact structure that stores a reference to a stack. */
+union handle_parts {
+	depot_stack_handle_t handle;
+	struct {
+		u32 pool_index	: DEPOT_POOL_INDEX_BITS;
+		u32 offset	: DEPOT_OFFSET_BITS;
+		u32 extra	: STACK_DEPOT_EXTRA_BITS;
+	};
+};
+
+struct stack_record {
+	struct list_head hash_list;	/* Links in the hash table */
+	u32 hash;			/* Hash in hash table */
+	u32 size;			/* Number of stored frames */
+	union handle_parts handle;	/* Constant after initialization */
+	refcount_t count;
+	union {
+		unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES];	/* Frames */
+		struct {
+			/*
+			 * An important invariant of the implementation is to
+			 * only place a stack record onto the freelist iff its
+			 * refcount is zero. Because stack records with a zero
+			 * refcount are never considered as valid, it is safe to
+			 * union @entries and freelist management state below.
+			 * Conversely, as soon as an entry is off the freelist
+			 * and its refcount becomes non-zero, the below must not
+			 * be accessed until being placed back on the freelist.
+			 */
+			struct list_head free_list;	/* Links in the freelist */
+			unsigned long rcu_state;	/* RCU cookie */
+		};
+	};
+};
+
 typedef u32 depot_flags_t;
 
 /*
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 4a7055a63d9f..6f9095374847 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -36,54 +36,11 @@ 
 #include <linux/memblock.h>
 #include <linux/kasan-enabled.h>
 
-#define DEPOT_HANDLE_BITS (sizeof(depot_stack_handle_t) * 8)
-
-#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
-#define DEPOT_POOL_SIZE (1LL << (PAGE_SHIFT + DEPOT_POOL_ORDER))
-#define DEPOT_STACK_ALIGN 4
-#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGE_SHIFT - DEPOT_STACK_ALIGN)
-#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
-			       STACK_DEPOT_EXTRA_BITS)
 #define DEPOT_POOLS_CAP 8192
 #define DEPOT_MAX_POOLS \
 	(((1LL << (DEPOT_POOL_INDEX_BITS)) < DEPOT_POOLS_CAP) ? \
 	 (1LL << (DEPOT_POOL_INDEX_BITS)) : DEPOT_POOLS_CAP)
 
-/* Compact structure that stores a reference to a stack. */
-union handle_parts {
-	depot_stack_handle_t handle;
-	struct {
-		u32 pool_index	: DEPOT_POOL_INDEX_BITS;
-		u32 offset	: DEPOT_OFFSET_BITS;
-		u32 extra	: STACK_DEPOT_EXTRA_BITS;
-	};
-};
-
-struct stack_record {
-	struct list_head hash_list;	/* Links in the hash table */
-	u32 hash;			/* Hash in hash table */
-	u32 size;			/* Number of stored frames */
-	union handle_parts handle;	/* Constant after initialization */
-	refcount_t count;
-	union {
-		unsigned long entries[CONFIG_STACKDEPOT_MAX_FRAMES];	/* Frames */
-		struct {
-			/*
-			 * An important invariant of the implementation is to
-			 * only place a stack record onto the freelist iff its
-			 * refcount is zero. Because stack records with a zero
-			 * refcount are never considered as valid, it is safe to
-			 * union @entries and freelist management state below.
-			 * Conversely, as soon as an entry is off the freelist
-			 * and its refcount becomes non-zero, the below must not
-			 * be accessed until being placed back on the freelist.
-			 */
-			struct list_head free_list;	/* Links in the freelist */
-			unsigned long rcu_state;	/* RCU cookie */
-		};
-	};
-};
-
 static bool stack_depot_disabled;
 static bool __stack_depot_early_init_requested __initdata = IS_ENABLED(CONFIG_STACKDEPOT_ALWAYS_INIT);
 static bool __stack_depot_early_init_passed __initdata;