On Tue, May 21, 2024 at 11:53:29AM +0900, Jaewon Kim wrote: > >--------- Original Message --------- > >Sender : 김재원 <jaewon31.kim@xxxxxxxxxxx>System Performance Lab.(MX)/삼성전자 > >Date : 2024-05-21 11:40 (GMT+9) > >Title : [RESEND PATCH 00/10] memblock: introduce memsize showing reserved memory > >? > >Some of memory regions can be reserved for a specific purpose. They are > >usually defined through reserved-memory in device tree. If only size > >without address is specified in device tree, the address of the region > >will be determined at boot time. > > > >We may find the address of the memory regions through booting log, but > >it does not show all. And it could be hard to catch the very beginning > >log. The memblock_dump_all shows all memblock status but it does not > >show region name and its information is difficult to summarize. > > > >This patch introduce a debugfs node, memblock/memsize, to see reserved > >memory easily. > > > >Here's an example > > > >$ cat debugfs/memblock/memsize > > > >0x0000000000000000-0x0000000000000000 0x02000000 (? 32768 KB )? map reusable linux,cma > >0x0000000000000000-0x0000000000000000 0x01000000 (? 16384 KB )? map reusable vxxxxx > >... > >0x0000000000000000-0x0000000000000000 0x004e0000 (? ? 4992 KB ) nomap unusable unknown > >0x0000000000000000-0x0000000000000000 0x00400000 (? ? 4096 KB ) nomap unusable cxxxxx > >0x0000000000000000-0x0000000000000000 0x00e00000 (? 14336 KB ) nomap unusable gxxxxx > > > >Reserved? ? : 1223856 KB > > .kernel? ? :? 275208 KB > >? .text? ? :? 16576 KB > >? .rwdata? :? ? 1963 KB > >? .rodata? :? 11920 KB > >? .bss? ? ? :? ? 2450 KB > >? .memmap? :? 186368 KB > >? .etc? ? ? :? 55933 KB > > .unusable? :? 948648 KB > >System? ? ? : 11359056 KB > > .common? ? : 10306384 KB > > .reusable? : 1052672 KB > >Total? ? ? : 12582912 KB ( 12288.00 MB ) > > > >Jaewon Kim (10): > >? memblock: introduce memsize showing reserved memory > >? memblock: detect hidden memory hole size > >? memblock: handle overlapped reserved memory region > >? memblock: take a region intersecting an unknown region > >? memblock: track memblock changed at early param > >? memblock: recognize late freed size by checking PageReserved > >? memblock: track kernel size on memsize > >? memblock: print memsize summary information > >? memblock: print kernel internal size > >? memblock: support memsize reusable to consider as reusable > > > > drivers/of/fdt.c? ? ? ? ? ? |? 11 + > > drivers/of/of_reserved_mem.c |? 12 +- > > include/linux/memblock.h? ? |? 29 ++ > > init/main.c? ? ? ? ? ? ? ? ? |? 13 +- > > kernel/dma/contiguous.c? ? ? |? 9 +- > > mm/Kconfig? ? ? ? ? ? ? ? ? |? 16 ++ > > mm/memblock.c? ? ? ? ? ? ? ? | 502 ++++++++++++++++++++++++++++++++++- > > mm/mm_init.c? ? ? ? ? ? ? ? |? 6 +- > > mm/page_alloc.c? ? ? ? ? ? ? |? 10 +- > > 9 files changed, 597 insertions(+), 11 deletions(-) > > > >-- > >2.25.1 > > Hello Mike > > This is actually RESEND as it was introduced 2 years ago. > Please refer to https://lore.kernel.org/linux-mm/YkQB6Ah603yPR3qf@xxxxxxxxxx/#t > > > But you never provided details about *why* you want this information exposed. > > For your question, I'd like to say ; > We can see the same format and exact information between different version of kernel status. > > 1) Internally we can check if the reserved memory changes. > 2) Externally we can communicate between chipset vendors and OEM, with a same format. Why the existing debugfs interface is not sufficient? > This helps us to communitcate well, to easily detect changes or just to see differences. > > Jaewon Kim > -- Sincerely yours, Mike.
