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authorHannu Nyman <hannu.nyman@iki.fi>2020-11-24 08:39:48 +0200
committerPetr Štetiar <ynezz@true.cz>2020-12-22 18:59:10 +0100
commit3d12b47985fc1983849925d2dc23430f55210c80 (patch)
tree9b2e833445b3e6470a2e151c5402fb45b33d4c3a
parent3064651bf75d3ca08cbfff916a14e8b3c4c246fb (diff)
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base-files: flush kernel memory cache during sysupgrade
Flush kernel memory caches during sysupgrade in order to mitigate the impact from memory consumption spikes in low-RAM devices. This may help to prevent sysupgrade causing a reboot before the actual flashing starts. Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
-rw-r--r--package/base-files/files/lib/upgrade/common.sh1
-rwxr-xr-xpackage/base-files/files/lib/upgrade/stage21
2 files changed, 2 insertions, 0 deletions
diff --git a/package/base-files/files/lib/upgrade/common.sh b/package/base-files/files/lib/upgrade/common.sh
index a5c27dc2fb..b44a5998f4 100644
--- a/package/base-files/files/lib/upgrade/common.sh
+++ b/package/base-files/files/lib/upgrade/common.sh
@@ -297,6 +297,7 @@ indicate_upgrade() {
# $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
default_do_upgrade() {
sync
+ echo 3 > /proc/sys/vm/drop_caches
if [ -n "$UPGRADE_BACKUP" ]; then
get_image "$1" "$2" | mtd $MTD_ARGS $MTD_CONFIG_ARGS -j "$UPGRADE_BACKUP" write - "${PART_NAME:-image}"
else
diff --git a/package/base-files/files/lib/upgrade/stage2 b/package/base-files/files/lib/upgrade/stage2
index c7629c383f..23d356a447 100755
--- a/package/base-files/files/lib/upgrade/stage2
+++ b/package/base-files/files/lib/upgrade/stage2
@@ -123,6 +123,7 @@ kill_remaining KILL 1
sleep 1
+echo 3 > /proc/sys/vm/drop_caches
if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
platform_pre_upgrade "$IMAGE"