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Date: Fri, 22 Feb 2019 20:48:03 +1100 (AEDT) From: Michael Ellerman <patch-notifications@...erman.id.au> To: Christophe Leroy <christophe.leroy@....fr>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Paul Mackerras <paulus@...ba.org> Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Subject: Re: powerpc: dump as a single line areas mapping a single physical page. On Mon, 2019-02-18 at 12:25:20 UTC, Christophe Leroy wrote: > When using KASAN, there are parts of the shadow area where all > pages are mapped to the kasan_early_shadow_page. It is pointless > to dump one line for each of those pages (in the example below there > are 7168 entries pointing to the same physical page). > > ~# cat /sys/kernel/debug/kernel_page_tables > ... > ---[ kasan shadow mem start ]--- > 0xf7c00000-0xf8bfffff 0x06fac000 16M rw present dirty accessed > 0xf8c00000-0xf8c03fff 0x00cd0000 16K r present dirty accessed > 0xf8c04000-0xf8c07fff 0x00cd0000 16K r present dirty accessed > 0xf8c08000-0xf8c0bfff 0x00cd0000 16K r present dirty accessed > 0xf8c0c000-0xf8c0ffff 0x00cd0000 16K r present dirty accessed > 0xf8c10000-0xf8c13fff 0x00cd0000 16K r present dirty accessed > ... 7168 identical lines > 0xffbfc000-0xffbfffff 0x00cd0000 16K r present dirty accessed > ---[ kasan shadow mem end ]--- > ... > > This patch modifies linux table dump to dump as a single line areas > where all addresses points to the same physical page. That physical > address is put inside [] to show that all virt pages points to the > same phys page. > > ~# cat /sys/kernel/debug/kernel_page_tables > ... > ---[ kasan shadow mem start ]--- > 0xf7c00000-0xf8bfffff 0x06fac000 16M rw present dirty accessed > 0xf8c00000-0xffbfffff [0x00cd0000] 16K r present dirty accessed > ---[ kasan shadow mem end ]--- > ... > > Signed-off-by: Christophe Leroy <christophe.leroy@....fr> Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/cabe8138b23c92e851b92c6a20ffb135 cheers
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