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[malloc] Track maximum heap usage 

Track the current and maximum heap usage, and display the maximum
during shutdown when DEBUG=malloc is enabled.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown 2017-03-22 20:01:25 +02:00
parent 65a3518013
commit c90b4d82b7
2 changed files with 23 additions and 3 deletions
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24
src/core/malloc.c
View File

@ -93,6 +93,12 @@ static LIST_HEAD ( free_blocks );
/** Total amount of free memory */
size_t freemem;
/** Total amount of used memory */
size_t usedmem;
/** Maximum amount of used memory */
size_t maxusedmem;
/**
* Heap size
*
@ -351,8 +357,11 @@ void * alloc_memblock ( size_t size, size_t align, size_t offset ) {
VALGRIND_MAKE_MEM_NOACCESS ( pre,
sizeof ( *pre ) );
}
/* Update total free memory */
/* Update memory usage statistics */
freemem -= actual_size;
usedmem += actual_size;
if ( usedmem > maxusedmem )
maxusedmem = usedmem;
/* Return allocated block */
DBGC2 ( &heap, "Allocated [%p,%p)\n", block,
( ( ( void * ) block ) + size ) );
@ -474,8 +483,9 @@ void free_memblock ( void *ptr, size_t size ) {
VALGRIND_MAKE_MEM_NOACCESS ( block, sizeof ( *block ) );
}
/* Update free memory counter */
/* Update memory usage statistics */
freemem += actual_size;
usedmem -= actual_size;
check_blocks();
valgrind_make_blocks_noaccess();
@ -629,10 +639,17 @@ void * zalloc ( size_t size ) {
* @c start must be aligned to at least a multiple of sizeof(void*).
*/
void mpopulate ( void *start, size_t len ) {
/* Prevent free_memblock() from rounding up len beyond the end
* of what we were actually given...
*/
free_memblock ( start, ( len & ~( MIN_MEMBLOCK_SIZE - 1 ) ) );
len &= ~( MIN_MEMBLOCK_SIZE - 1 );
/* Add to allocation pool */
free_memblock ( start, len );
/* Fix up memory usage statistics */
usedmem += len;
}
/**
@ -656,6 +673,7 @@ struct init_fn heap_init_fn __init_fn ( INIT_EARLY ) = {
*/
static void shutdown_cache ( int booting __unused ) {
discard_all_cache();
DBGC ( &heap, "Maximum heap usage %zdkB\n", ( maxusedmem >> 10 ) );
}
/** Memory allocator shutdown function */

2
src/include/ipxe/malloc.h
View File

@ -22,6 +22,8 @@ FILE_LICENCE ( GPL2_OR_LATER_OR_UBDL );
#include <valgrind/memcheck.h>
extern size_t freemem;
extern size_t usedmem;
extern size_t maxusedmem;
extern void * __malloc alloc_memblock ( size_t size, size_t align,
size_t offset );