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Culling by comparing stacktrace would casue loss of some information. For
example, if there exists 2 blocks which have the same stacktrace and the
different head info
Page allocated via order 0, mask 0x108c48(...), pid 73696,
ts 1578829190639010 ns, free_ts 1576583851324450 ns
prep_new_page+0x80/0xb8
get_page_from_freelist+0x924/0xee8
__alloc_pages+0x138/0xc18
alloc_pages+0x80/0xf0
__page_cache_alloc+0x90/0xc8
Page allocated via order 0, mask 0x108c48(...), pid 61806,
ts 1354113726046100 ns, free_ts 1354104926841400 ns
prep_new_page+0x80/0xb8
get_page_from_freelist+0x924/0xee8
__alloc_pages+0x138/0xc18
alloc_pages+0x80/0xf0
__page_cache_alloc+0x90/0xc8
After culling, it would be like this
2 times, 2 pages:
Page allocated via order 0, mask 0x108c48(...), pid 73696,
ts 1578829190639010 ns, free_ts 1576583851324450 ns
prep_new_page+0x80/0xb8
get_page_from_freelist+0x924/0xee8
__alloc_pages+0x138/0xc18
alloc_pages+0x80/0xf0
__page_cache_alloc+0x90/0xc8
The info of second block missed. So, add -c to turn on culling by
stacktrace. By default, it will cull by txt.
Link: https://lkml.kernel.org/r/20211129145658.2491-1-zhangyinan2019@email.szu.edu.cn
Signed-off-by: Yinan Zhang <zhangyinan2019@email.szu.edu.cn>
Cc: Changhee Han <ch0.han@lge.com>
Cc: Sean Anderson <seanga2@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Tang Bin <tangbin@cmss.chinamobile.com>
Cc: Zhang Shengju <zhangshengju@cmss.chinamobile.com>
Cc: Zhenliang Wei <weizhenliang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
cd75ea0e32