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New monitoring function for slab allocator

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Added __get_slab_usage() function which can be used to query the slab allocator memory usage at runtime.
This commit is contained in:
obarthel
2016-11-19 15:49:21 +01:00
parent 3425e33cf9
commit 799ee705e8
23 changed files with 241 additions and 106 deletions
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84
library/stdlib_slab.c
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@ -84,6 +84,7 @@ __slab_allocate(size_t allocation_size)
AddTail((struct List *)&__slab_data.sd_SingleAllocations,(struct Node *)single_allocation);
__slab_data.sd_NumSingleAllocations++;
__slab_data.sd_TotalSingleAllocationSize += sizeof(*single_allocation) + allocation_size;
allocation = &single_allocation[1];
@ -118,7 +119,7 @@ __slab_allocate(size_t allocation_size)
* size that still works.
*/
for(slab_index = 2, chunk_size = (1UL << slab_index) ;
slab_index < 31 ;
slab_index < (int)NUM_ENTRIES(__slab_data.sd_Slabs) ;
slab_index++, chunk_size += chunk_size)
{
if(entry_size <= chunk_size)
@ -374,6 +375,10 @@ __slab_free(void * address,size_t allocation_size)
__slab_data.sd_NumSingleAllocations--;
assert( __slab_data.sd_TotalSingleAllocationSize <= sizeof(*mn) + allocation_size );
__slab_data.sd_TotalSingleAllocationSize -= sizeof(*mn) + allocation_size;
D(("number of single allocations = %ld", __slab_data.sd_NumSingleAllocations));
}
/* Otherwise the allocation should have come from a slab. */
@ -400,7 +405,7 @@ __slab_free(void * address,size_t allocation_size)
* size that still works.
*/
for(slab_index = 2, chunk_size = (1UL << slab_index) ;
slab_index < 31 ;
slab_index < (int)NUM_ENTRIES(__slab_data.sd_Slabs) ;
slab_index++, chunk_size += chunk_size)
{
if(entry_size <= chunk_size)
@ -517,10 +522,12 @@ __slab_init(size_t slab_size)
D(("activating slab allocator"));
memset(&__slab_data,0,sizeof(__slab_data));
assert( size <= slab_size );
/* Start with an empty list of slabs for each chunk size. */
for(i = 0 ; i < 31 ; i++)
for(i = 0 ; i < (int)NUM_ENTRIES(__slab_data.sd_Slabs) ; i++)
NewList((struct List *)&__slab_data.sd_Slabs[i]);
NewList((struct List *)&__slab_data.sd_SingleAllocations);
@ -536,48 +543,51 @@ __slab_init(size_t slab_size)
void
__slab_exit(void)
{
struct SlabNode * sn;
struct SlabNode * sn_next;
struct MinNode * mn;
struct MinNode * mn_next;
int i;
ENTER();
D(("freeing slabs"));
/* Free the memory allocated for each slab. */
for(i = 0 ; i < 31 ; i++)
if(__slab_data.sd_InUse)
{
if(__slab_data.sd_Slabs[i].mlh_Head->mln_Succ != NULL)
D(("freeing slab #%ld (%lu bytes per chunk)", i, (1UL << i)));
struct SlabNode * sn;
struct SlabNode * sn_next;
struct MinNode * mn;
struct MinNode * mn_next;
int i;
for(sn = (struct SlabNode *)__slab_data.sd_Slabs[i].mlh_Head ;
sn->sn_MinNode.mln_Succ != NULL ;
sn = sn_next)
D(("freeing slabs"));
/* Free the memory allocated for each slab. */
for(i = 0 ; i < (int)NUM_ENTRIES(__slab_data.sd_Slabs) ; i++)
{
sn_next = (struct SlabNode *)sn->sn_MinNode.mln_Succ;
if(__slab_data.sd_Slabs[i].mlh_Head->mln_Succ != NULL)
D(("freeing slab #%ld (%lu bytes per chunk)", i, (1UL << i)));
FreeVec(sn);
for(sn = (struct SlabNode *)__slab_data.sd_Slabs[i].mlh_Head ;
sn->sn_MinNode.mln_Succ != NULL ;
sn = sn_next)
{
sn_next = (struct SlabNode *)sn->sn_MinNode.mln_Succ;
FreeVec(sn);
}
}
if(__slab_data.sd_SingleAllocations.mlh_Head->mln_Succ != NULL)
D(("freeing single allocations"));
/* Free the memory allocated for each allocation which did not
* go into a slab.
*/
for(mn = __slab_data.sd_SingleAllocations.mlh_Head ;
mn->mln_Succ != NULL ;
mn = mn_next)
{
mn_next = mn->mln_Succ;
FreeVec(mn);
}
__slab_data.sd_InUse = FALSE;
}
if(__slab_data.sd_SingleAllocations.mlh_Head->mln_Succ != NULL)
D(("freeing single allocations"));
/* Free the memory allocated for each allocation which did not
* go into a slab.
*/
for(mn = __slab_data.sd_SingleAllocations.mlh_Head ;
mn->mln_Succ != NULL ;
mn = mn_next)
{
mn_next = mn->mln_Succ;
FreeVec(mn);
}
__slab_data.sd_InUse = FALSE;
LEAVE();
}