On 2024/03/04 10:43, Shijie Huang wrote: > Hi Kazu, > > 在 2023/12/21 10:56, HAGIO KAZUHITO(萩尾 一仁) 写道: >> On 2023/12/19 0:01, Huang Shijie wrote: >>> If the kernel exports the vmmemap then we can use that symbol in >>> crash to optimize access. vmmemap is just an array of page structs >>> after all. >>> >>> This patch tries to: >>> 1.) Get the "vmemmap" from the vmcore file. >>> If we can use the "vmemmap", we implement the >>> arm64_vmemmap_is_page_ptr >>> and set it to machdep->is_page_ptr. >>> 2.) We implement the fast page_to_pfn code in >>> arm64_vmemmap_is_page_ptr. >>> 3.) Dump it in "help -m" >>> >>> Test result: >>> Without the this patch: >>> #files -p xxx > /dev/null (xxx is the inode of vmlinux which is >>> 441M) >>> This costed about 185 seconds. >>> >>> With the this patch: >>> #files -p xxx > /dev/null (xxx is the inode of vmlinux which is >>> 441M) >>> This costed 3 seconds. >>> >>> Signed-off-by: Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx> >>> --- >>> v3 --> v4: >>> Use "files -p" to measure the time. >>> Dump it in "help -m" >> Acked-by: Kazuhito Hagio <k-hagio-ab@xxxxxxx> >> >> Applied the 1/2 first, >> https://github.com/crash-utility/crash/commit/19d3c56c9fca >> >> and will apply this when a corresponding kernel patch gets applied. > > The corresponding kernel patch has been merged: > > https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/crash_core-export-vmemmap-when-config_sparsemem_vmemmap-is-enabled.patch > > > Could you please merge this one for crash? Thank you for the info, usually we merge when it lands in the mainline, so will do at 6.9-rc1? Thanks, Kazu -- Crash-utility mailing list -- devel@xxxxxxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to devel-leave@xxxxxxxxxxxxxxxxxxxxxxxxxxx https://${domain_name}/admin/lists/devel.lists.crash-utility.osci.io/ Contribution Guidelines: https://github.com/crash-utility/crash/wiki
