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SubjectRe: Performance regressions in "boot_time" tests in Linux 5.8 Kernel
On 11/20/20 at 03:11am, Rahul Gopakumar wrote:
> Hi Baoquan,
>
> To which commit should we apply the draft patch. We tried applying
> the patch to the commit 3e4fb4346c781068610d03c12b16c0cfb0fd24a3
> (the one we used for applying the previous patch) but it fails.

I tested on 5.10-rc3+. You can append below change to the old patch in
your testing kernel.

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fa6076e1a840..5e5b74e88d69 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -448,6 +448,8 @@ defer_init(int nid, unsigned long pfn, unsigned long end_pfn)
if (end_pfn < pgdat_end_pfn(NODE_DATA(nid)))
return false;

+ if (NODE_DATA(nid)->first_deferred_pfn != ULONG_MAX)
+ return true;
/*
* We start only with one section of pages, more pages are added as
* needed until the rest of deferred pages are initialized.
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