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base-files: flush kernel memory cache during sysupgrade

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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>
This commit is contained in:
Hannu Nyman
2020-11-24 08:39:48 +02:00
committed by Petr Štetiar
parent 3064651bf7
commit 3d12b47985
2 changed files with 2 additions and 0 deletions
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1
package/base-files/files/lib/upgrade/common.sh
View File

@@ -297,6 +297,7 @@ indicate_upgrade() {
# $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m # $(2): (optional) pipe command to extract firmware, e.g. dd bs=n skip=m
default_do_upgrade() { default_do_upgrade() {
sync sync
echo 3 > /proc/sys/vm/drop_caches
if [ -n "$UPGRADE_BACKUP" ]; then if [ -n "$UPGRADE_BACKUP" ]; then
get_image "$1" "$2" | mtd $MTD_ARGS $MTD_CONFIG_ARGS -j "$UPGRADE_BACKUP" write - "${PART_NAME:-image}" get_image "$1" "$2" | mtd $MTD_ARGS $MTD_CONFIG_ARGS -j "$UPGRADE_BACKUP" write - "${PART_NAME:-image}"
else else

1
package/base-files/files/lib/upgrade/stage2
View File

@@ -123,6 +123,7 @@ kill_remaining KILL 1
sleep 1 sleep 1
echo 3 > /proc/sys/vm/drop_caches
if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then if [ -n "$IMAGE" ] && type 'platform_pre_upgrade' >/dev/null 2>/dev/null; then
platform_pre_upgrade "$IMAGE" platform_pre_upgrade "$IMAGE"