[t:3825] #3825 Add max_mem_in_use to memory statistics.

git-svn-id: file:///svn/toku/tokudb@35067 c7de825b-a66e-492c-adef-691d508d4ae1

buildheader/db.h_4_1

@@ -210,6 +210,7 @@ typedef struct __toku_engine_status {
   uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ 
   uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ 
   uint64_t         mem_freed;               /* number of bytes freed */ 
+  uint64_t         max_mem_in_use;          /* estimatd max value of (used - freed) */ 
 } ENGINE_STATUS;
 typedef enum {
  DB_BTREE=1,

buildheader/db.h_4_3

@@ -210,6 +210,7 @@ typedef struct __toku_engine_status {
   uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ 
   uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ 
   uint64_t         mem_freed;               /* number of bytes freed */ 
+  uint64_t         max_mem_in_use;          /* estimatd max value of (used - freed) */ 
 } ENGINE_STATUS;
 typedef enum {
  DB_BTREE=1,

buildheader/db.h_4_4

@@ -210,6 +210,7 @@ typedef struct __toku_engine_status {
   uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ 
   uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ 
   uint64_t         mem_freed;               /* number of bytes freed */ 
+  uint64_t         max_mem_in_use;          /* estimatd max value of (used - freed) */ 
 } ENGINE_STATUS;
 typedef enum {
  DB_BTREE=1,

buildheader/db.h_4_5

@@ -210,6 +210,7 @@ typedef struct __toku_engine_status {
   uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ 
   uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ 
   uint64_t         mem_freed;               /* number of bytes freed */ 
+  uint64_t         max_mem_in_use;          /* estimatd max value of (used - freed) */ 
 } ENGINE_STATUS;
 typedef enum {
  DB_BTREE=1,

buildheader/make_db_h.c

@@ -603,6 +603,7 @@ int main (int argc __attribute__((__unused__)), char *const argv[] __attribute__
     printf("  uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ \n");
     printf("  uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ \n");
     printf("  uint64_t         mem_freed;               /* number of bytes freed */ \n");
+    printf("  uint64_t         max_mem_in_use;          /* estimated max value of (used - freed) */ \n");
     printf("} ENGINE_STATUS;\n");
 
     print_dbtype();

buildheader/tdb.h

@@ -210,6 +210,7 @@ typedef struct __toku_engine_status {
   uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ 
   uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ 
   uint64_t         mem_freed;               /* number of bytes freed */ 
+  uint64_t         max_mem_in_use;          /* estimatd max value of (used - freed) */ 
 } ENGINE_STATUS;
 typedef enum {
  DB_BTREE=1,

include/db.h

@@ -210,6 +210,7 @@ typedef struct __toku_engine_status {
   uint64_t         mem_requested;           /* number of bytes requested via malloc/realloc */ 
   uint64_t         mem_used;                /* number of bytes used (obtained from malloc_usable_size()) */ 
   uint64_t         mem_freed;               /* number of bytes freed */ 
+  uint64_t         max_mem_in_use;          /* estimatd max value of (used - freed) */ 
 } ENGINE_STATUS;
 typedef enum {
  DB_BTREE=1,

src/ydb.c

@@ -2032,6 +2032,7 @@ env_get_engine_status(DB_ENV * env, ENGINE_STATUS * engstat, char * env_panic_st
 	    engstat->mem_requested  = memory_status.requested;
 	    engstat->mem_used       = memory_status.used;
 	    engstat->mem_freed      = memory_status.freed;
+	    engstat->max_mem_in_use = memory_status.max_in_use;
 	}
     }
     return r;
@@ -2213,6 +2214,7 @@ env_get_engine_status_text(DB_ENV * env, char * buff, int bufsiz) {
 	n += snprintf(buff + n, bufsiz - n, "mem_requested                    %"PRIu64"\n", engstat.mem_requested);
 	n += snprintf(buff + n, bufsiz - n, "mem_used                         %"PRIu64"\n", engstat.mem_used);
 	n += snprintf(buff + n, bufsiz - n, "mem_freed                        %"PRIu64"\n", engstat.mem_freed);
+	n += snprintf(buff + n, bufsiz - n, "max_mem_in_use                   %"PRIu64"\n", engstat.max_mem_in_use);
     }
     if (n > bufsiz) {
 	char * errmsg = "BUFFER TOO SMALL\n";

toku_include/memory.h

@@ -116,6 +116,7 @@ typedef struct memory_status {
   uint64_t requested;       // number of bytes requested
   uint64_t used;            // number of bytes used (requested + overhead), obtained from malloc_usable_size()
   uint64_t freed;           // number of bytes freed;
+  uint64_t max_in_use;      // maximum memory footprint (used - freed), approximate (not worth threadsafety overhead for exact)
 } MEMORY_STATUS_S, *MEMORY_STATUS;
 
 void toku_memory_get_status(MEMORY_STATUS s);

windows/memory.c

@@ -25,6 +25,17 @@ toku_memory_get_status(MEMORY_STATUS s) {
 }
 
 
+// max_in_use may be slightly off because use of max_in_use is not thread-safe.
+// It is not worth the overhead to make it completely accurate.
+static inline void 
+set_max(uint64_t sum_used, uint64_t sum_freed) {
+    uint64_t in_use = (sum_used - sum_freed);
+    if ((!(in_use & 0x8000000000000000)) // if wrap due to another thread, ignore bogus "negative" value
+	&& (in_use > status.max_in_use)) {
+	status.max_in_use = in_use;
+    }
+}
+
 
 void *toku_malloc(size_t size) {
     void *p = t_malloc ? t_malloc(size) : os_malloc(size);
@@ -32,7 +43,8 @@ void *toku_malloc(size_t size) {
       size_t used = malloc_usable_size(p);
       __sync_add_and_fetch(&status.malloc_count, 1L);
       __sync_add_and_fetch(&status.requested, size);
-      __sync_add_and_fetch(&status.used, used);
+      uint64_t sum_used = __sync_add_and_fetch(&status.used, used);
+      set_max(sum_used, status.freed);
     }
     else
       __sync_add_and_fetch(&status.malloc_fail, 1L);
@@ -55,8 +67,9 @@ toku_realloc(void *p, size_t size) {
 	size_t used = malloc_usable_size(q);
 	__sync_add_and_fetch(&status.realloc_count, 1L);
 	__sync_add_and_fetch(&status.requested, size);
-	__sync_add_and_fetch(&status.used, used);
-	__sync_add_and_fetch(&status.freed, used_orig);
+	uint64_t sum_used  = __sync_add_and_fetch(&status.used, used);
+	uint64_t sum_freed = __sync_add_and_fetch(&status.freed, used_orig);
+	set_max(sum_used, sum_freed);
     }
     else
 	__sync_add_and_fetch(&status.realloc_fail, 1L);
@@ -101,7 +114,8 @@ toku_xmalloc(size_t size) {
     size_t used = malloc_usable_size(p);
     __sync_add_and_fetch(&status.malloc_count, 1L);
     __sync_add_and_fetch(&status.requested, size);
-    __sync_add_and_fetch(&status.used, used);
+    uint64_t sum_used = __sync_add_and_fetch(&status.used, used);
+    set_max(sum_used, status.freed);
     return p;
 }
 
@@ -122,8 +136,9 @@ toku_xrealloc(void *v, size_t size) {
     size_t used = malloc_usable_size(p);
     __sync_add_and_fetch(&status.realloc_count, 1L);
     __sync_add_and_fetch(&status.requested, size);
-    __sync_add_and_fetch(&status.used, used);
-    __sync_add_and_fetch(&status.freed, used_orig);
+    uint64_t sum_used  = __sync_add_and_fetch(&status.used, used);
+    uint64_t sum_freed = __sync_add_and_fetch(&status.freed, used_orig);
+    set_max(sum_used, sum_freed);
     return p;
 }