Status: Accepted
Owner: ----
CC: [email protected]
Labels: Type-Enhancement Priority-Medium KASAN
New issue 288 by [email protected]: kasan: poor performance due to stack
trace collection instrumentation
http://code.google.com/p/address-sanitizer/issues/detail?id=288
Here is the hottest function in profile:
10.52% foo [kernel.kallsyms] [k] __kasan_read8
|
--- __kasan_read8
|
|--19.75%-- print_context_stack
| dump_trace
| save_stack_trace
| asan_compress_and_save_stack_trace
| |
| |--52.16%-- asan_slab_free
| | |
| | |--54.60%-- kfree
| --47.84%-- asan_slab_alloc
| |
| |--51.28%-- kmem_cache_alloc
Almost all calls come from asan_compress_and_save_stack_trace <-
kmalloc/kfree.
Stack collection must not be instrumented by kasan.
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