1#!/bin/ksh -p 2 3# 4# This file and its contents are supplied under the terms of the 5# Common Development and Distribution License ("CDDL"), version 1.0. 6# You may only use this file in accordance with the terms of version 7# 1.0 of the CDDL. 8# 9# A full copy of the text of the CDDL should have accompanied this 10# source. A copy of the CDDL is also available via the Internet at 11# http://www.illumos.org/license/CDDL. 12# 13 14# 15# Copyright (c) 2015, 2016 by Delphix. All rights reserved. 16# 17 18. $STF_SUITE/include/libtest.shlib 19 20# 21# DESCRIPTION: 22# msync()s of mmap()'ed file should complete quickly during 23# background dirty page writebacks by the kernel. 24# 25 26function cleanup 27{ 28 log_must eval "echo $saved_vm_dirty_expire_centisecs > /proc/sys/vm/dirty_expire_centisecs" 29 log_must eval "echo $saved_vm_dirty_background_ratio > /proc/sys/vm/dirty_background_ratio" 30 log_must eval "echo $saved_vm_dirty_writeback_centisecs > /proc/sys/vm/dirty_writeback_centisecs" 31 32 # revert to some sensible defaults if the values we saved 33 # were incorrect due to a previous run being interrupted 34 if [ $(</proc/sys/vm/dirty_expire_centisecs) -eq 1 ]; then 35 log_must eval "echo 3000 > /proc/sys/vm/dirty_expire_centisecs" 36 fi 37 38 if [ $(</proc/sys/vm/dirty_background_ratio) -eq 0 ]; then 39 log_must eval "echo 10 > /proc/sys/vm/dirty_background_ratio" 40 fi 41 42 if [ $(</proc/sys/vm/dirty_writeback_centisecs) -eq 1 ]; then 43 log_must eval "echo 500 > /proc/sys/vm/dirty_writeback_centisecs" 44 fi 45} 46 47if ! is_linux; then 48 log_unsupported "Only supported on Linux, requires /proc/sys/vm/ tunables" 49fi 50 51log_onexit cleanup 52log_assert "Run the tests for mmap_sync" 53 54read -r saved_vm_dirty_expire_centisecs < /proc/sys/vm/dirty_expire_centisecs 55read -r saved_vm_dirty_background_ratio < /proc/sys/vm/dirty_background_ratio 56read -r saved_vm_dirty_writeback_centisecs < /proc/sys/vm/dirty_writeback_centisecs 57 58log_must eval "echo 1 > /proc/sys/vm/dirty_expire_centisecs" 59log_must eval "echo 1 > /proc/sys/vm/dirty_background_bytes" 60log_must eval "echo 1 > /proc/sys/vm/dirty_writeback_centisecs" 61 62log_must mmap_sync 63log_pass "mmap_sync tests passed." 64