On Mon, 2019-08-12 at 17:06 +0100, Catalin Marinas wrote: > 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(). > > Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> > --- > init/main.c | 2 +- > lib/Kconfig.debug | 11 +- > mm/kmemleak.c | 267 +++++----------------------------------------- > 3 files changed, 35 insertions(+), 245 deletions(-) > > diff --git a/init/main.c b/init/main.c > index 96f8d5af52d6..ca05e3cd7ef7 100644 > --- a/init/main.c > +++ b/init/main.c > @@ -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(); > diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug > index 4d39540011e2..39df06ffd9f4 100644 > --- a/lib/Kconfig.debug > +++ b/lib/Kconfig.debug > @@ -592,17 +592,18 @@ config DEBUG_KMEMLEAK > In order to access the kmemleak file, debugfs needs to be > mounted (usually at /sys/kernel/debug). > > -config DEBUG_KMEMLEAK_EARLY_LOG_SIZE > - int "Maximum kmemleak early log entries" > +config DEBUG_KMEMLEAK_MEM_POOL_SIZE > + int "Kmemleak memory pool size" > depends on DEBUG_KMEMLEAK > range 200 40000 > default 16000 Hmm, this seems way too small. My previous round of testing with kmemleak.mempool=524288 works quite well on all architectures.
