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Message-Id: <20230830184958.2333078-10-ankur.a.arora@oracle.com>
Date: Wed, 30 Aug 2023 11:49:58 -0700
From: Ankur Arora <ankur.a.arora@...cle.com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org, x86@...nel.org
Cc: akpm@...ux-foundation.org, luto@...nel.org, bp@...en8.de,
dave.hansen@...ux.intel.com, hpa@...or.com, mingo@...hat.com,
juri.lelli@...hat.com, vincent.guittot@...aro.org,
willy@...radead.org, mgorman@...e.de, peterz@...radead.org,
rostedt@...dmis.org, tglx@...utronix.de, jon.grimm@....com,
bharata@....com, raghavendra.kt@....com,
boris.ostrovsky@...cle.com, konrad.wilk@...cle.com,
Ankur Arora <ankur.a.arora@...cle.com>
Subject: [PATCH v2 9/9] x86/clear_huge_page: make clear_contig_region() preemptible
clear_contig_region() can be used for clearing regions as large as a
gigantic page. Allow preemption in irqentry_exit to make sure we don't
hold on to the CPU for an arbitrarily long period.
Signed-off-by: Ankur Arora <ankur.a.arora@...cle.com>
---
arch/x86/mm/hugetlbpage.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/arch/x86/mm/hugetlbpage.c b/arch/x86/mm/hugetlbpage.c
index 0b9f7a6dad93..55d1d15ea618 100644
--- a/arch/x86/mm/hugetlbpage.c
+++ b/arch/x86/mm/hugetlbpage.c
@@ -152,7 +152,12 @@ hugetlb_get_unmapped_area(struct file *file, unsigned long addr,
#ifndef CONFIG_HIGHMEM
static void clear_contig_region(struct page *page, unsigned int npages)
{
+ /*
+ * We might be clearing a large region. Allow rescheduling.
+ */
+ allow_resched();
clear_pages(page_address(page), npages);
+ disallow_resched();
}
/*
--
2.31.1
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