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| author | Stefan Metzmacher <metze@samba.org> | 2011-04-04 13:28:11 +0200 |
|---|---|---|
| committer | Stefan Metzmacher <metze@samba.org> | 2011-04-08 09:28:10 +0200 |
| commit | 6126c3506d493cd4836a7539586b74faea8ca0b3 (patch) | |
| tree | eff94fbdf7e43bdec846f1a04f6567460998fa6a /lib | |
| parent | 4895f55f0604a1851d45c24a8a584a10170d5917 (diff) | |
| download | samba-6126c3506d493cd4836a7539586b74faea8ca0b3.tar.gz samba-6126c3506d493cd4836a7539586b74faea8ca0b3.tar.bz2 samba-6126c3506d493cd4836a7539586b74faea8ca0b3.zip | |
talloc: add TC_INVALIDATE_SHRINK_CHUNK() marco
This invalidates the unused bytes if we shrink memory.
metze
Signed-off-By: Andrew Tridgell <tridge@samba.org>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/talloc/talloc.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/lib/talloc/talloc.c b/lib/talloc/talloc.c index 522d60ff8f..3ec5d85eee 100644 --- a/lib/talloc/talloc.c +++ b/lib/talloc/talloc.c @@ -143,6 +143,32 @@ static struct { TC_INVALIDATE_FULL_VALGRIND_CHUNK(_tc); \ } while (0) +#define TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size) do { \ + if (unlikely(talloc_fill.enabled)) { \ + size_t _flen = (_tc)->size - (_new_size); \ + char *_fptr = TC_PTR_FROM_CHUNK(_tc); \ + _fptr += (_new_size); \ + memset(_fptr, talloc_fill.fill_value, _flen); \ + } \ +} while (0) + +#if defined(DEVELOPER) && defined(VALGRIND_MAKE_MEM_NOACCESS) +/* Mark the unused bytes not accessable */ +#define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { \ + size_t _flen = (_tc)->size - (_new_size); \ + char *_fptr = TC_PTR_FROM_CHUNK(_tc); \ + _fptr += (_new_size); \ + VALGRIND_MAKE_MEM_NOACCESS(_fptr, _flen); \ +} while (0) +#else +#define TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size) do { } while (0) +#endif + +#define TC_INVALIDATE_SHRINK_CHUNK(_tc, _new_size) do { \ + TC_INVALIDATE_SHRINK_FILL_CHUNK(_tc, _new_size); \ + TC_INVALIDATE_SHRINK_VALGRIND_CHUNK(_tc, _new_size); \ +} while (0) + struct talloc_reference_handle { struct talloc_reference_handle *next, *prev; void *ptr; @@ -1282,12 +1308,14 @@ _PUBLIC_ void *_talloc_realloc(const void *context, void *ptr, size_t size, cons if (size < tc->size) { if (pool_tc) { void *next_tc = TC_POOLMEM_NEXT_CHUNK(tc); + TC_INVALIDATE_SHRINK_CHUNK(tc, size); tc->size = size; if (next_tc == pool_tc->pool) { pool_tc->pool = TC_POOLMEM_NEXT_CHUNK(tc); } return ptr; } else if ((tc->size - size) < 1024) { + TC_INVALIDATE_SHRINK_CHUNK(tc, size); /* do not shrink if we have less than 1k to gain */ tc->size = size; return ptr; |