Hi, On 11/27/23 at 10:07am, Huang Shijie wrote: > In memory_model.h, if CONFIG_SPARSEMEM_VMEMMAP is configed, > kernel will use vmemmap to do the __pfn_to_page/page_to_pfn, > and kernel will not use the "classic sparse" to do the > __pfn_to_page/page_to_pfn. > > So export the vmemmap when CONFIG_SPARSEMEM_VMEMMAP is configed. > This makes the user applications (crash, etc) get faster > pfn_to_page/page_to_pfn operations too. Are there Crash or makedupfile patches posted yet to make use of this? > > Signed-off-by: Huang Shijie <shijie@xxxxxxxxxxxxxxxxxxxxxx> > --- > kernel/crash_core.c | 3 +++ > 1 file changed, 3 insertions(+) > > diff --git a/kernel/crash_core.c b/kernel/crash_core.c > index efe87d501c8c..9653c4177191 100644 > --- a/kernel/crash_core.c > +++ b/kernel/crash_core.c > @@ -765,6 +765,9 @@ static int __init crash_save_vmcoreinfo_init(void) > VMCOREINFO_SYMBOL(mem_map); > VMCOREINFO_SYMBOL(contig_page_data); > #endif > +#ifdef CONFIG_SPARSEMEM_VMEMMAP > + VMCOREINFO_SYMBOL_ARRAY(vmemmap); > +#endif > #ifdef CONFIG_SPARSEMEM > VMCOREINFO_SYMBOL_ARRAY(mem_section); > VMCOREINFO_LENGTH(mem_section, NR_SECTION_ROOTS); > -- > 2.40.1 > _______________________________________________ kexec mailing list kexec@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/kexec
