tools/vm/page_owner_sort.c: sort by stacktrace before culling
The contents of page_owner have changed to include more information than the stack trace. On a modern kernel, the blocks look like Page allocated via order 0, mask 0x0(), pid 1, ts 165564237 ns, free_ts 0 ns register_early_stack+0x4b/0x90 init_page_owner+0x39/0x250 kernel_init_freeable+0x11e/0x242 kernel_init+0x16/0x130 Sorting by the contents of .txt will result in almost no repeated pages, as the pid, ts, and free_ts will almost never be the same. Instead, sort by the contents of the stack trace, which we assume to be whatever is after the first line. [seanga2@gmail.com: fix NULL-pointer dereference when comparing stack traces] Link: https://lkml.kernel.org/r/20211125162653.1855958-1-seanga2@gmail.com Link: https://lkml.kernel.org/r/20211124193709.1805776-1-seanga2@gmail.comSigned-off-by: Sean Anderson <seanga2@gmail.com> Cc: Changhee Han <ch0.han@lge.com> Cc: Tang Bin <tangbin@cmss.chinamobile.com> Cc: Zhang Shengju <zhangshengju@cmss.chinamobile.com> Cc: Zhenliang Wei <weizhenliang@huawei.com> Cc: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Yinan Zhang <zhangyinan2019@email.szu.edu.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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