apache/nuttx
1
0
Fork 0
mirror of https://github.com/apache/nuttx.git synced 2025-05-08 22:32:04 +08:00
Code Issues Packages Projects Releases Wiki Activity

fs/shm/shmfs_alloc.c: Allocate zero-initialized memory in flat build

Browse Source 
POSIX requires that the shm objects are zero-initialized. This has been broken
in some earlier commits (starting from 9af5fc5d09724a5d300bc07ce85b9ba5c01ffadd)

Also fix the flat build memory allocation to allocate both object data and payload
in the same chunk (as the comment also suggests). This saves allocations and memory
in a system with lots of shm objects.

Signed-off-by: Jukka Laitinen <jukkax@ssrc.tii.ae>
This commit is contained in:
Jukka Laitinen 2024-12-12 12:22:39 +02:00 committed by Xiang Xiao
parent 890cf4764f
commit 366977b767
1 changed files with 27 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
fs/shm/shmfs_alloc.c
View File

@ -51,24 +51,26 @@ FAR struct shmfs_object_s *shmfs_alloc_object(size_t length)
* chunk in kernel heap
*/
object = fs_heap_zalloc(sizeof(struct shmfs_object_s));
size_t hdr_size = sizeof(struct shmfs_object_s);
size_t alloc_size = length;
size_t cachesize = up_get_dcache_linesize();
if (cachesize > 0)
{
hdr_size = ALIGN_UP(hdr_size, cachesize);
alloc_size = ALIGN_UP(alloc_size, cachesize);
object = fs_heap_memalign(cachesize, hdr_size + alloc_size);
}
else
{
object = fs_heap_malloc(hdr_size + alloc_size);
}
if (object)
{
size_t cachesize = up_get_dcache_linesize();
if (cachesize > 0)
{
object->paddr = fs_heap_memalign(cachesize,
ALIGN_UP(length, cachesize));
}
else
{
object->paddr = fs_heap_malloc(length);
}
if (object->paddr)
{
allocated = true;
}
memset(object, 0, hdr_size + alloc_size);
object->paddr = (void *)((uintptr_t)object + hdr_size);
allocated = true;
}
#elif defined(CONFIG_BUILD_PROTECTED)
@ -76,23 +78,27 @@ FAR struct shmfs_object_s *shmfs_alloc_object(size_t length)
* memory in user heap
*/
size_t alloc_size = length;
object = fs_heap_zalloc(sizeof(struct shmfs_object_s));
if (object)
{
size_t cachesize = up_get_dcache_linesize();
if (cachesize > 0)
{
object->paddr = kumm_memalign(cachesize,
ALIGN_UP(length, cachesize));
alloc_size = ALIGN_UP(alloc_size, cachesize);
object->paddr = kumm_memalign(cachesize, alloc_size);
}
else
{
object->paddr = kumm_malloc(length);
object->paddr = kumm_malloc(alloc_size);
}
if (object->paddr)
{
allocated = true;
memset(object->paddr, 0, alloc_size);
allocated = true;
}
}
@ -152,9 +158,7 @@ void shmfs_free_object(FAR struct shmfs_object_s *object)
{
if (object)
{
#if defined(CONFIG_BUILD_FLAT)
fs_heap_free(object->paddr);
#elif defined(CONFIG_BUILD_PROTECTED)
#if defined(CONFIG_BUILD_PROTECTED)
kumm_free(object->paddr);
#elif defined(CONFIG_BUILD_KERNEL)
size_t i;