Hi, On Thu, Mar 24, 2022 at 04:01:50PM +0900, Jaewon Kim wrote: > 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 > 0x0f9000000-0x0fb000000 0x02000000 ( 32768 KB ) map reusable linux,cma > 0x0b1900000-0x0b1b00000 0x00200000 ( 2048 KB ) nomap unusable test1 > 0x0b0200000-0x0b0400000 0x00200000 ( 2048 KB ) map unusable test2 > (snipped) > > Reserved : 746924 KB > .kernel : 137027 KB > .text : 28158 KB > .rwdata : 3238 KB > .rodata : 13468 KB > .bss : 12570 KB > .etc : 79593 KB > .unusable : 609897 KB > System : 3447380 KB > .common : 3152468 KB > .reusable : 294912 KB > Total : 4194304 KB ( 4096.00 MB ) Most of this information information is already available at various places, like the existing memblock debugfs, /proc/iomem and DT sysfs. I don't see why we need yet another debugfs file to expose it. > Jaewon Kim (8): > memblock: introduce memsize showing reserved memory > memblock: detect hidden memory hole size > memblock: handle overlapped reserved memory region > memblock: track memblock changed at early param > memblock: track kernel size on memsize > memblock: recognize late free by checking PageReserved > memblock: print memsize summary information > memblock: print kernel internal size > > drivers/of/fdt.c | 10 + > drivers/of/of_reserved_mem.c | 7 +- > include/linux/memblock.h | 21 ++ > include/linux/mm.h | 3 + > init/main.c | 13 +- > kernel/dma/contiguous.c | 9 +- > mm/Kconfig | 7 + > mm/memblock.c | 434 ++++++++++++++++++++++++++++++++++- > mm/page_alloc.c | 15 +- > 9 files changed, 506 insertions(+), 13 deletions(-) > > -- > 2.17.1 > -- Sincerely yours, Mike.
