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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
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From: Zhang Boyang <zhangboyang.id@gmail.com>
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Date: Sat, 15 Oct 2022 22:15:11 +0800
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Subject: [PATCH] mm: Try invalidate disk caches last when out of memory
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Every heap grow will cause all disk caches invalidated which decreases
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performance severely. This patch moves disk cache invalidation code to
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the last of memory squeezing measures. So, disk caches are released only
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when there are no other ways to get free memory.
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Signed-off-by: Zhang Boyang <zhangboyang.id@gmail.com>
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Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
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Reviewed-by: Patrick Steinhardt <ps@pks.im>
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(cherry picked from commit 17975d10a80e2457e5237f87fa58a7943031983e)
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---
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grub-core/kern/mm.c | 14 +++++++-------
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1 file changed, 7 insertions(+), 7 deletions(-)
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diff --git a/grub-core/kern/mm.c b/grub-core/kern/mm.c
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index f2e27f263b..da1ac9427c 100644
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--- a/grub-core/kern/mm.c
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+++ b/grub-core/kern/mm.c
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@@ -443,12 +443,6 @@ grub_memalign (grub_size_t align, grub_size_t size)
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switch (count)
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{
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case 0:
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- /* Invalidate disk caches. */
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- grub_disk_cache_invalidate_all ();
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- count++;
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- goto again;
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-
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- case 1:
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/* Request additional pages, contiguous */
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count++;
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@@ -458,7 +452,7 @@ grub_memalign (grub_size_t align, grub_size_t size)
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/* fallthrough */
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- case 2:
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+ case 1:
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/* Request additional pages, anything at all */
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count++;
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@@ -474,6 +468,12 @@ grub_memalign (grub_size_t align, grub_size_t size)
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/* fallthrough */
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+ case 2:
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+ /* Invalidate disk caches. */
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+ grub_disk_cache_invalidate_all ();
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+ count++;
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+ goto again;
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+
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default:
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break;
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}
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