Messages in this thread Patch in this message | | | Date | Sun, 4 Mar 2012 23:49:31 -0800 (PST) | From | Zhenzhong Duan <> | Subject | 答复: [PATCH] Initialize max pfn mapped a s initial ident mapping size for x86 64 |
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----- zhenzhong.duan@oracle.com 写道:
> It's better to initialize max_pfn_mapped as initial ident > mapping size but not initial kernel map size for x86_64. > This is also in accordance with i386 code. > > It lead to page tables allocation to as high as 1G for > init_memory_mapping, > this will allow larger crashkernel reservation. > > Tested on HP DL980G7, it can reserve more than 521MiB space for kdump > kernel now. > http://bugzilla.oracle.com/bugzilla/show_bug.cgi?id=13405 > > Cc: Thomas Gleixner <tglx@linutronix.de> > Cc: Ingo Molnar <mingo@redhat.com> > Cc: "H. Peter Anvin" <hpa@zytor.com> > Cc: Yinghai Lu <yinghai@kernel.org> > Signed-off-by: Zhenzhong Duan <zhenzhong.duan@oracle.com> > Tested-by: Dawei Pang <dawei.pang@hp.com> > --- > arch/x86/kernel/head64.c | 2 +- > 1 files changed, 1 insertions(+), 1 deletions(-) > > diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c > index 3a3b779..3beb94f 100644 > --- a/arch/x86/kernel/head64.c > +++ b/arch/x86/kernel/head64.c > @@ -77,7 +77,7 @@ void __init x86_64_start_kernel(char * > real_mode_data) > /* Make NULL pointers segfault */ > zap_identity_mappings(); > > - max_pfn_mapped = KERNEL_IMAGE_SIZE >> PAGE_SHIFT; > + max_pfn_mapped = PUD_PAGE_SIZE >> PAGE_SHIFT; > > for (i = 0; i < NUM_EXCEPTION_VECTORS; i++) { > #ifdef CONFIG_EARLY_PRINTK > -- > 1.7.3
Hmm, any comment is welcome thanks
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