From: Vijay Balakrishna <vijayb@linux.microsoft.com>
To: Andrew Morton <akpm@linux-foundation.org>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Oleg Nesterov <oleg@redhat.com>, Song Liu <songliubraving@fb.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Pavel Tatashin <pasha.tatashin@soleen.com>,
Vijay Balakrishna <vijayb@linux.microsoft.com>,
Michal Hocko <mhocko@suse.com>, Allen Pais <apais@microsoft.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [v1] mm: khugepaged: avoid overriding min_free_kbytes set by user
Date: Mon, 14 Sep 2020 21:55:48 -0700 [thread overview]
Message-ID: <1600145748-26518-1-git-send-email-vijayb@linux.microsoft.com> (raw)
set_recommended_min_free_kbytes need to honor min_free_kbytes set by the
user. Post start-of-day THP enable or memory hotplug operations can
lose user specified min_free_kbytes, in particular when it is higher than
calculated recommended value.
Signed-off-by: Vijay Balakrishna <vijayb@linux.microsoft.com>
Cc: stable@vger.kernel.org
---
mm/khugepaged.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 4f7107476a6f..b4b753ba411a 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -2253,7 +2253,7 @@ static void set_recommended_min_free_kbytes(void)
{
struct zone *zone;
int nr_zones = 0;
- unsigned long recommended_min;
+ int recommended_min;
for_each_populated_zone(zone) {
/*
@@ -2280,12 +2280,12 @@ static void set_recommended_min_free_kbytes(void)
/* don't ever allow to reserve more than 5% of the lowmem */
recommended_min = min(recommended_min,
- (unsigned long) nr_free_buffer_pages() / 20);
+ (int) nr_free_buffer_pages() / 20);
recommended_min <<= (PAGE_SHIFT-10);
- if (recommended_min > min_free_kbytes) {
+ if (recommended_min > user_min_free_kbytes) {
if (user_min_free_kbytes >= 0)
- pr_info("raising min_free_kbytes from %d to %lu to help transparent hugepage allocations\n",
+ pr_info("raising min_free_kbytes from %d to %d to help transparent hugepage allocations\n",
min_free_kbytes, recommended_min);
min_free_kbytes = recommended_min;
--
2.28.0
next reply other threads:[~2020-09-15 4:56 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-15 4:55 Vijay Balakrishna [this message]
2020-09-15 18:27 ` [v1] mm: khugepaged: avoid overriding min_free_kbytes set by user Pavel Tatashin
2020-09-15 19:31 ` Vijay Balakrishna
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