[Crash-utility] Re: [PATCH v4] arm64: Add vmemmap support

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(a)os.amperecomputing.com&gt; >> --- >> v3 --> v4: >>     Use "files -p" to measure the time. >>     Dump it in "help -m" > Acked-by: Kazuhito Hagio <k-hagio-ab(a)nec.com&gt; > > 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?