sdm660-common: Override readahead to 128KiB after post-boot
* Qualcomm decided to increase the read-ahead value to 512KiB [1]. * This value resulted in frequent cases where read-ahead would be waiting for new I/O requests and thus ending up being synchronous rather than asynchronous. * As result, the main goal of Qualcomm's patch [1] which is to increase throughput ends up in a regression where read throughput is significantly lower than it ever would be with the recommended [2] read-ahead value. * This patch uses our existing loop in ramdisk to set the read-ahead value to 128KiB. [1] https://source.codeaurora.org/quic/la/kernel/msm-4.19/commit/include/linux/mm.h?h=LA.UM.9.12.r1-09000-SMxx50.0&id=25d04e4ceb7c067907901842c223d62973d73a75 [2] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/tree/include/linux/mm.h?h=v4.19.160#n2397 Change-Id: I1980d904568fe4f1ce7b676452bcc44e4689f02f Co-authored-by: clarencelol <clarencekuiek@icloud.com>
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2 changed files with 5 additions and 18 deletions
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@ -370,12 +370,8 @@ function configure_zram_parameters() {
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}
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function configure_read_ahead_kb_values() {
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MemTotalStr=`cat /proc/meminfo | grep MemTotal`
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MemTotal=${MemTotalStr:16:8}
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# Set 128 for <= 3GB &
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# set 512 for >= 4GB targets.
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if [ $MemTotal -le 3145728 ]; then
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# Set 128 for all targets
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echo 128 > /sys/block/mmcblk0/bdi/read_ahead_kb
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echo 128 > /sys/block/mmcblk0/queue/read_ahead_kb
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echo 128 > /sys/block/mmcblk0rpmb/bdi/read_ahead_kb
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@ -383,15 +379,6 @@ function configure_read_ahead_kb_values() {
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echo 128 > /sys/block/dm-0/queue/read_ahead_kb
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echo 128 > /sys/block/dm-1/queue/read_ahead_kb
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echo 128 > /sys/block/dm-2/queue/read_ahead_kb
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else
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echo 512 > /sys/block/mmcblk0/bdi/read_ahead_kb
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echo 512 > /sys/block/mmcblk0/queue/read_ahead_kb
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echo 512 > /sys/block/mmcblk0rpmb/bdi/read_ahead_kb
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echo 512 > /sys/block/mmcblk0rpmb/queue/read_ahead_kb
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echo 512 > /sys/block/dm-0/queue/read_ahead_kb
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echo 512 > /sys/block/dm-1/queue/read_ahead_kb
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echo 512 > /sys/block/dm-2/queue/read_ahead_kb
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fi
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}
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function disable_core_ctl() {
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@ -413,10 +413,10 @@ on property:persist.vendor.ssr.enable_ramdumps=0
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on property:sys.boot_completed=1
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write /dev/kmsg "Boot completed "
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#Reset read ahead for dm-0, dm-1 and dm-2 to 512kb
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write /sys/block/dm-0/queue/read_ahead_kb 512
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write /sys/block/dm-1/queue/read_ahead_kb 512
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write /sys/block/dm-2/queue/read_ahead_kb 512
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#Reset read ahead for dm-0, dm-1 and dm-2 to 128kb
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write /sys/block/dm-0/queue/read_ahead_kb 128
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write /sys/block/dm-1/queue/read_ahead_kb 128
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write /sys/block/dm-2/queue/read_ahead_kb 128
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#WDSP FW boot sysfs node used by STHAL
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chown media audio /sys/kernel/wdsp0/boot
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chown media audio /sys/kernel/wcd_cpe0/fw_name
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