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mm: kmemleak: use the memory pool for early allocations

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Currently kmemleak uses a static early_log buffer to trace all memory
allocation/freeing before the slab allocator is initialised.  Such early
log is replayed during kmemleak_init() to properly initialise the kmemleak
metadata for objects allocated up that point.  With a memory pool that
does not rely on the slab allocator, it is possible to skip this early log
entirely.

In order to remove the early logging, consider kmemleak_enabled == 1 by
default while the kmem_cache availability is checked directly on the
object_cache and scan_area_cache variables.  The RCU callback is only
invoked after object_cache has been initialised as we wouldn't have any
concurrent list traversal before this.

In order to reduce the number of callbacks before kmemleak is fully
initialised, move the kmemleak_init() call to mm_init().

[[email protected]: coding-style fixes]
[[email protected]: remove WARN_ON(), per Catalin]
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>
Cc: Matthew Wilcox <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Qian Cai <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Catalin Marinas 2019-09-23 15:34:05 -07:00 • committed by Linus Torvalds
commit c566586818
3 changed files with 33 additions and 245 deletions
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2
init/main.c
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@ -556,6 +556,7 @@ static void __init mm_init(void)
report_meminit();
mem_init();
kmem_cache_init();
kmemleak_init();
pgtable_init();
debug_objects_mem_init();
vmalloc_init();
@ -740,7 +741,6 @@ asmlinkage __visible void __init start_kernel(void)
initrd_start = 0;
}
#endif
kmemleak_init();
setup_per_cpu_pageset();
numa_policy_init();
acpi_early_init();