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Detect memory leaks when memory type is being destroyed.

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This is very helpful for detecting kernel modules memory leaks on unload.

Discussed and reviewed by:	rwatson
This commit is contained in:
Pawel Jakub Dawidek 2005-11-03 13:48:59 +00:00
parent 9d14a9a235
commit 2a143d5bf5
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=152017
1 changed files with 21 additions and 0 deletions
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21
sys/kern/kern_malloc.c
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@ -608,7 +608,10 @@ void
malloc_uninit(void *data)
{
struct malloc_type_internal *mtip;
struct malloc_type_stats *mtsp;
struct malloc_type *mtp, *temp;
long temp_allocs, temp_bytes;
int i;
mtp = data;
KASSERT(mtp->ks_handle != NULL, ("malloc_deregister: cookie NULL"));
@ -625,6 +628,24 @@ malloc_uninit(void *data)
kmemstatistics = mtp->ks_next;
kmemcount--;
mtx_unlock(&malloc_mtx);
/*
* Look for memory leaks.
*/
temp_allocs = temp_bytes = 0;
for (i = 0; i < MAXCPU; i++) {
mtsp = &mtip->mti_stats[i];
temp_allocs += mtsp->mts_numallocs;
temp_allocs -= mtsp->mts_numfrees;
temp_bytes += mtsp->mts_memalloced;
temp_bytes -= mtsp->mts_memfreed;
}
if (temp_allocs > 0 || temp_bytes > 0) {
printf("Warning: memory type %s leaked memory on destroy "
"(%ld allocations, %ld bytes leaked).\n", mtp->ks_shortdesc,
temp_allocs, temp_bytes);
}
uma_zfree(mt_zone, mtip);
}