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? Thanks Huang Shijie -- 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
