| #!/bin/ksh -p |
| |
| # |
| # This file and its contents are supplied under the terms of the |
| # Common Development and Distribution License ("CDDL"), version 1.0. |
| # You may only use this file in accordance with the terms of version |
| # 1.0 of the CDDL. |
| # |
| # A full copy of the text of the CDDL should have accompanied this |
| # source. A copy of the CDDL is also available via the Internet at |
| # http://www.illumos.org/license/CDDL. |
| # |
| |
| # |
| # Copyright (c) 2015, 2016 by Delphix. All rights reserved. |
| # |
| |
| . $STF_SUITE/include/libtest.shlib |
| |
| # |
| # DESCRIPTION: |
| # msync()s of mmap()'ed file should complete quickly during |
| # background dirty page writebacks by the kernel. |
| # |
| |
| function cleanup |
| { |
| log_must eval "echo $saved_vm_dirty_expire_centisecs > /proc/sys/vm/dirty_expire_centisecs" |
| log_must eval "echo $saved_vm_dirty_background_ratio > /proc/sys/vm/dirty_background_ratio" |
| log_must eval "echo $saved_vm_dirty_writeback_centisecs > /proc/sys/vm/dirty_writeback_centisecs" |
| |
| # revert to some sensible defaults if the values we saved |
| # were incorrect due to a previous run being interrupted |
| if [ $(</proc/sys/vm/dirty_expire_centisecs) -eq 1 ]; then |
| log_must eval "echo 3000 > /proc/sys/vm/dirty_expire_centisecs" |
| fi |
| |
| if [ $(</proc/sys/vm/dirty_background_ratio) -eq 0 ]; then |
| log_must eval "echo 10 > /proc/sys/vm/dirty_background_ratio" |
| fi |
| |
| if [ $(</proc/sys/vm/dirty_writeback_centisecs) -eq 1 ]; then |
| log_must eval "echo 500 > /proc/sys/vm/dirty_writeback_centisecs" |
| fi |
| } |
| |
| if ! is_linux; then |
| log_unsupported "Only supported on Linux, requires /proc/sys/vm/ tunables" |
| fi |
| |
| log_onexit cleanup |
| log_assert "Run the tests for mmap_sync" |
| |
| read -r saved_vm_dirty_expire_centisecs < /proc/sys/vm/dirty_expire_centisecs |
| read -r saved_vm_dirty_background_ratio < /proc/sys/vm/dirty_background_ratio |
| read -r saved_vm_dirty_writeback_centisecs < /proc/sys/vm/dirty_writeback_centisecs |
| |
| log_must eval "echo 1 > /proc/sys/vm/dirty_expire_centisecs" |
| log_must eval "echo 1 > /proc/sys/vm/dirty_background_bytes" |
| log_must eval "echo 1 > /proc/sys/vm/dirty_writeback_centisecs" |
| |
| log_must mmap_sync |
| log_pass "mmap_sync tests passed." |