branches/zip: Implement the INFORMATION_SCHEMA tables

INNODB_COMPRESSION_BUDDY and INNODB_COMPRESSION_BUDDY_RESET.

buf_buddy_stat_struct, buf_buddy_stat_t, buf_buddy_stat[]:
Statistics of the buddy system grouped by block size.

i_s_innodb_compression_buddy, i_s_innodb_compression_buddy_reset:
New INFORMATION_SCHEMA plugins.

i_s_compression_buddy_fields_info[]: Define the fields:
size, used, free, relocated, relocated_sec.

i_s_compression_buddy_fill_low(), i_s_compression_buddy_fill(),
i_s_compression_buddy_reset_fill(): Fill the fields.

i_s_compression_buddy_init(), i_s_compression_buddy_reset_init():
Initialize the tables.

buf/buf0buddy.c

@@ -24,15 +24,9 @@ Created December 2006 by Marko Makela
 Protected by buf_pool_mutex. */
 static ulint buf_buddy_n_frames;
 #endif /* UNIV_DEBUG */
-/** Counts of blocks allocated from the buddy system.
+/** Statistics of the buddy system, indexed by block size.
 Protected by buf_pool_mutex. */
-UNIV_INTERN ulint buf_buddy_used[BUF_BUDDY_SIZES + 1];
+UNIV_INTERN buf_buddy_stat_t buf_buddy_stat[BUF_BUDDY_SIZES + 1];
-/** Counts of blocks relocated by the buddy system.
-Protected by buf_pool_mutex. */
-UNIV_INTERN ib_uint64_t buf_buddy_relocated[BUF_BUDDY_SIZES + 1];
-/** Durations of block relocations.
-Protected by buf_pool_mutex. */
-UNIV_INTERN ullint buf_buddy_relocated_duration[BUF_BUDDY_SIZES + 1];
 
 /**************************************************************************
 Get the offset of the buddy of a compressed page frame. */
@@ -317,7 +311,7 @@ alloc_big:
 	block = buf_buddy_alloc_from(block->frame, i, BUF_BUDDY_SIZES);
 
 func_exit:
-	buf_buddy_used[i]++;
+	buf_buddy_stat[i].used++;
 	return(block);
 }
 
@@ -460,9 +454,13 @@ buf_buddy_relocate(
 			mutex_exit(mutex);
 success:
 			UNIV_MEM_INVALID(src, size);
-			buf_buddy_relocated[i]++;
+			{
-			buf_buddy_relocated_duration[i]
+				buf_buddy_stat_t*	buddy_stat
+					= &buf_buddy_stat[i];
+				buddy_stat->relocated++;
+				buddy_stat->relocated_usec
 					+= ut_time_us(NULL) - usec;
+			}
 			return(TRUE);
 		}
 
@@ -495,9 +493,9 @@ buf_buddy_free_low(
 	ut_ad(buf_pool_mutex_own());
 	ut_ad(!mutex_own(&buf_pool_zip_mutex));
 	ut_ad(i <= BUF_BUDDY_SIZES);
-	ut_ad(buf_buddy_used[i] > 0);
+	ut_ad(buf_buddy_stat[i].used > 0);
 
-	buf_buddy_used[i]--;
+	buf_buddy_stat[i].used--;
 recombine:
 	UNIV_MEM_ASSERT_AND_ALLOC(buf, BUF_BUDDY_LOW << i);
 	ut_d(((buf_page_t*) buf)->state = BUF_BLOCK_ZIP_FREE);

handler/ha_innodb.cc

@@ -8825,7 +8825,9 @@ i_s_innodb_trx,
 i_s_innodb_locks,
 i_s_innodb_lock_waits,
 i_s_innodb_compression,
-i_s_innodb_compression_reset
+i_s_innodb_compression_reset,
+i_s_innodb_compression_buddy,
+i_s_innodb_compression_buddy_reset
 mysql_declare_plugin_end;
 
 #ifdef UNIV_COMPILE_TEST_FUNCS

handler/i_s.cc

@@ -20,6 +20,7 @@ Created July 18, 2007 Vasil Dimov
 extern "C" {
 #include "trx0i_s.h"
 #include "trx0trx.h" /* for TRX_QUE_STATE_STR_MAX_LEN */
+#include "buf0buddy.h" /* for i_s_compression_buddy */
 #include "buf0buf.h" /* for buf_pool and PAGE_ZIP_MIN_SIZE */
 #include "ha_prototypes.h" /* for innobase_convert_name() */
 }
@@ -1255,6 +1256,267 @@ UNIV_INTERN struct st_mysql_plugin	i_s_innodb_compression_reset =
 	STRUCT_FLD(__reserved1, NULL)
 };
 
+/* Fields of the dynamic table information_schema.innodb_compression_buddy. */
+static ST_FIELD_INFO	i_s_compression_buddy_fields_info[] =
+{
+	{STRUCT_FLD(field_name,		"size"),
+	 STRUCT_FLD(field_length,	5),
+	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
+	 STRUCT_FLD(value,		0),
+	 STRUCT_FLD(field_flags,	0),
+	 STRUCT_FLD(old_name,		"Block Size"),
+	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
+
+	{STRUCT_FLD(field_name,		"used"),
+	 STRUCT_FLD(field_length,	21),
+	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
+	 STRUCT_FLD(value,		0),
+	 STRUCT_FLD(field_flags,	0),
+	 STRUCT_FLD(old_name,		"Currently in Use"),
+	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
+
+	{STRUCT_FLD(field_name,		"free"),
+	 STRUCT_FLD(field_length,	21),
+	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
+	 STRUCT_FLD(value,		0),
+	 STRUCT_FLD(field_flags,	0),
+	 STRUCT_FLD(old_name,		"Currently Available"),
+	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
+
+	{STRUCT_FLD(field_name,		"relocated"),
+	 STRUCT_FLD(field_length,	21),
+	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
+	 STRUCT_FLD(value,		0),
+	 STRUCT_FLD(field_flags,	0),
+	 STRUCT_FLD(old_name,		"Total Number of Relocations"),
+	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
+
+	{STRUCT_FLD(field_name,		"relocated_sec"),
+	 STRUCT_FLD(field_length,	42),
+	 STRUCT_FLD(field_type,		MYSQL_TYPE_LONG),
+	 STRUCT_FLD(value,		0),
+	 STRUCT_FLD(field_flags,	0),
+	 STRUCT_FLD(old_name,		"Total Duration of Relocations"),
+	 STRUCT_FLD(open_method,	SKIP_OPEN_TABLE)},
+
+	END_OF_ST_FIELD_INFO
+};
+
+/***********************************************************************
+Fill the dynamic table information_schema.innodb_compression_buddy or
+innodb_compression_buddy_reset. */
+static
+int
+i_s_compression_buddy_fill_low(
+/*===========================*/
+				/* out: 0 on success, 1 on failure */
+	THD*		thd,	/* in: thread */
+	TABLE_LIST*	tables,	/* in/out: tables to fill */
+	COND*		cond,	/* in: condition (ignored) */
+	ibool		reset)	/* in: TRUE=reset cumulated counts */
+{
+	TABLE*	table	= (TABLE *) tables->table;
+	int	status	= 0;
+
+	DBUG_ENTER("i_s_compression_buddy_fill_low");
+
+	/* deny access to non-superusers */
+	if (check_global_access(thd, PROCESS_ACL)) {
+
+		DBUG_RETURN(0);
+	}
+
+	buf_pool_mutex_enter();
+
+	for (uint x = 0; x <= BUF_BUDDY_SIZES; x++) {
+		buf_buddy_stat_t*	buddy_stat = &buf_buddy_stat[x];
+
+		table->field[0]->store(BUF_BUDDY_LOW << x);
+		table->field[1]->store(buddy_stat->used);
+		table->field[2]->store(UNIV_LIKELY(x < BUF_BUDDY_SIZES)
+				       ? UT_LIST_GET_LEN(buf_pool->zip_free[x])
+				       : 0);
+		table->field[3]->store((longlong) buddy_stat->relocated, true);
+		table->field[4]->store(
+			(ulong) (buddy_stat->relocated_usec / 1000000));
+
+		if (reset) {
+			memset(buddy_stat, 0, sizeof *buddy_stat);
+		}
+
+		if (schema_table_store_record(thd, table)) {
+			status = 1;
+			break;
+		}
+	}
+
+	buf_pool_mutex_exit();
+	DBUG_RETURN(status);
+}
+
+/***********************************************************************
+Fill the dynamic table information_schema.innodb_compression_buddy. */
+static
+int
+i_s_compression_buddy_fill(
+/*=======================*/
+				/* out: 0 on success, 1 on failure */
+	THD*		thd,	/* in: thread */
+	TABLE_LIST*	tables,	/* in/out: tables to fill */
+	COND*		cond)	/* in: condition (ignored) */
+{
+	return(i_s_compression_buddy_fill_low(thd, tables, cond, FALSE));
+}
+
+/***********************************************************************
+Fill the dynamic table information_schema.innodb_compression_buddy_reset. */
+static
+int
+i_s_compression_buddy_reset_fill(
+/*=============================*/
+				/* out: 0 on success, 1 on failure */
+	THD*		thd,	/* in: thread */
+	TABLE_LIST*	tables,	/* in/out: tables to fill */
+	COND*		cond)	/* in: condition (ignored) */
+{
+	return(i_s_compression_buddy_fill_low(thd, tables, cond, TRUE));
+}
+
+/***********************************************************************
+Bind the dynamic table information_schema.innodb_compression_buddy. */
+static
+int
+i_s_compression_buddy_init(
+/*=======================*/
+			/* out: 0 on success */
+	void*	p)	/* in/out: table schema object */
+{
+	DBUG_ENTER("i_s_compression_buddy_init");
+	ST_SCHEMA_TABLE* schema = (ST_SCHEMA_TABLE*) p;
+
+	schema->fields_info = i_s_compression_buddy_fields_info;
+	schema->fill_table = i_s_compression_buddy_fill;
+
+	DBUG_RETURN(0);
+}
+
+/***********************************************************************
+Bind the dynamic table information_schema.innodb_compression_buddy_reset. */
+static
+int
+i_s_compression_buddy_reset_init(
+/*=============================*/
+			/* out: 0 on success */
+	void*	p)	/* in/out: table schema object */
+{
+	DBUG_ENTER("i_s_compression_buddy_reset_init");
+	ST_SCHEMA_TABLE* schema = (ST_SCHEMA_TABLE*) p;
+
+	schema->fields_info = i_s_compression_buddy_fields_info;
+	schema->fill_table = i_s_compression_buddy_reset_fill;
+
+	DBUG_RETURN(0);
+}
+
+UNIV_INTERN struct st_mysql_plugin	i_s_innodb_compression_buddy =
+{
+	/* the plugin type (a MYSQL_XXX_PLUGIN value) */
+	/* int */
+	STRUCT_FLD(type, MYSQL_INFORMATION_SCHEMA_PLUGIN),
+
+	/* pointer to type-specific plugin descriptor */
+	/* void* */
+	STRUCT_FLD(info, &i_s_info),
+
+	/* plugin name */
+	/* const char* */
+	STRUCT_FLD(name, "INNODB_COMPRESSION_BUDDY"),
+
+	/* plugin author (for SHOW PLUGINS) */
+	/* const char* */
+	STRUCT_FLD(author, plugin_author),
+
+	/* general descriptive text (for SHOW PLUGINS) */
+	/* const char* */
+	STRUCT_FLD(descr, "Statistics for the InnoDB compressed buffer pool"),
+
+	/* the plugin license (PLUGIN_LICENSE_XXX) */
+	/* int */
+	STRUCT_FLD(license, PLUGIN_LICENSE_GPL),
+
+	/* the function to invoke when plugin is loaded */
+	/* int (*)(void*); */
+	STRUCT_FLD(init, i_s_compression_buddy_init),
+
+	/* the function to invoke when plugin is unloaded */
+	/* int (*)(void*); */
+	STRUCT_FLD(deinit, i_s_common_deinit),
+
+	/* plugin version (for SHOW PLUGINS) */
+	/* unsigned int */
+	STRUCT_FLD(version, 0x0100 /* 1.0 */),
+
+	/* struct st_mysql_show_var* */
+	STRUCT_FLD(status_vars, NULL),
+
+	/* struct st_mysql_sys_var** */
+	STRUCT_FLD(system_vars, NULL),
+
+	/* reserved for dependency checking */
+	/* void* */
+	STRUCT_FLD(__reserved1, NULL)
+};
+
+UNIV_INTERN struct st_mysql_plugin	i_s_innodb_compression_buddy_reset =
+{
+	/* the plugin type (a MYSQL_XXX_PLUGIN value) */
+	/* int */
+	STRUCT_FLD(type, MYSQL_INFORMATION_SCHEMA_PLUGIN),
+
+	/* pointer to type-specific plugin descriptor */
+	/* void* */
+	STRUCT_FLD(info, &i_s_info),
+
+	/* plugin name */
+	/* const char* */
+	STRUCT_FLD(name, "INNODB_COMPRESSION_BUDDY_RESET"),
+
+	/* plugin author (for SHOW PLUGINS) */
+	/* const char* */
+	STRUCT_FLD(author, plugin_author),
+
+	/* general descriptive text (for SHOW PLUGINS) */
+	/* const char* */
+	STRUCT_FLD(descr, "Statistics for the InnoDB compressed buffer pool;"
+		   " reset cumulated counts"),
+
+	/* the plugin license (PLUGIN_LICENSE_XXX) */
+	/* int */
+	STRUCT_FLD(license, PLUGIN_LICENSE_GPL),
+
+	/* the function to invoke when plugin is loaded */
+	/* int (*)(void*); */
+	STRUCT_FLD(init, i_s_compression_buddy_reset_init),
+
+	/* the function to invoke when plugin is unloaded */
+	/* int (*)(void*); */
+	STRUCT_FLD(deinit, i_s_common_deinit),
+
+	/* plugin version (for SHOW PLUGINS) */
+	/* unsigned int */
+	STRUCT_FLD(version, 0x0100 /* 1.0 */),
+
+	/* struct st_mysql_show_var* */
+	STRUCT_FLD(status_vars, NULL),
+
+	/* struct st_mysql_sys_var** */
+	STRUCT_FLD(system_vars, NULL),
+
+	/* reserved for dependency checking */
+	/* void* */
+	STRUCT_FLD(__reserved1, NULL)
+};
+
 /***********************************************************************
 Unbind a dynamic INFORMATION_SCHEMA table. */
 static

handler/i_s.h

@@ -14,5 +14,7 @@ extern struct st_mysql_plugin	i_s_innodb_locks;
 extern struct st_mysql_plugin	i_s_innodb_lock_waits;
 extern struct st_mysql_plugin	i_s_innodb_compression;
 extern struct st_mysql_plugin	i_s_innodb_compression_reset;
+extern struct st_mysql_plugin	i_s_innodb_compression_buddy;
+extern struct st_mysql_plugin	i_s_innodb_compression_buddy_reset;
 
 #endif /* i_s_h */

include/buf0buddy.h

@@ -50,15 +50,21 @@ buf_buddy_free(
 	ulint	size)	/* in: block size, up to UNIV_PAGE_SIZE */
 	__attribute__((nonnull));
 
-/** Counts of blocks allocated from the buddy system.
+/** Statistics of buddy blocks of a given size. */
+struct buf_buddy_stat_struct {
+	/** Number of blocks allocated from the buddy system. */
+	ulint		used;
+	/** Number of blocks relocated by the buddy system. */
+	ib_uint64_t	relocated;
+	/** Total duration of block relocations, in microseconds. */
+	ib_uint64_t	relocated_usec;
+};
+
+typedef struct buf_buddy_stat_struct buf_buddy_stat_t;
+
+/** Statistics of the buddy system, indexed by block size.
 Protected by buf_pool_mutex. */
-extern ulint buf_buddy_used[BUF_BUDDY_SIZES + 1];
+extern buf_buddy_stat_t buf_buddy_stat[BUF_BUDDY_SIZES + 1];
-/** Counts of blocks relocated by the buddy system.
-Protected by buf_pool_mutex. */
-extern ib_uint64_t buf_buddy_relocated[BUF_BUDDY_SIZES + 1];
-/** Durations of block relocations.
-Protected by buf_pool_mutex. */
-extern ullint buf_buddy_relocated_duration[BUF_BUDDY_SIZES + 1];
 
 #ifndef UNIV_NONINL
 # include "buf0buddy.ic"