在 2023/11/27 10:51, Baoquan He 写道:
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?
I have patches for Crash to use the 'vmemmap', but after this patch is
merged, I will send it out.
(I think Kazu will not merge a crash patch which depends on a kernel
patch which is not merged.)
Thanks
Huang Shijie
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
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