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

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.