1#!/bin/ksh -p 2# SPDX-License-Identifier: CDDL-1.0 3 4# 5# This file and its contents are supplied under the terms of the 6# Common Development and Distribution License ("CDDL"), version 1.0. 7# You may only use this file in accordance with the terms of version 8# 1.0 of the CDDL. 9# 10# A full copy of the text of the CDDL should have accompanied this 11# source. A copy of the CDDL is also available via the Internet at 12# http://www.illumos.org/license/CDDL. 13# 14 15# 16# Copyright (c) 2015, 2016 by Delphix. All rights reserved. 17# 18 19. $STF_SUITE/include/libtest.shlib 20 21# 22# DESCRIPTION: 23# msync()s of mmap()'ed file should complete quickly during 24# background dirty page writebacks by the kernel. 25# 26 27function cleanup 28{ 29 log_must eval "echo $saved_vm_dirty_expire_centisecs > /proc/sys/vm/dirty_expire_centisecs" 30 log_must eval "echo $saved_vm_dirty_background_ratio > /proc/sys/vm/dirty_background_ratio" 31 log_must eval "echo $saved_vm_dirty_writeback_centisecs > /proc/sys/vm/dirty_writeback_centisecs" 32 33 # revert to some sensible defaults if the values we saved 34 # were incorrect due to a previous run being interrupted 35 if [ $(</proc/sys/vm/dirty_expire_centisecs) -eq 1 ]; then 36 log_must eval "echo 3000 > /proc/sys/vm/dirty_expire_centisecs" 37 fi 38 39 if [ $(</proc/sys/vm/dirty_background_ratio) -eq 0 ]; then 40 log_must eval "echo 10 > /proc/sys/vm/dirty_background_ratio" 41 fi 42 43 if [ $(</proc/sys/vm/dirty_writeback_centisecs) -eq 1 ]; then 44 log_must eval "echo 500 > /proc/sys/vm/dirty_writeback_centisecs" 45 fi 46} 47 48if ! is_linux; then 49 log_unsupported "Only supported on Linux, requires /proc/sys/vm/ tunables" 50fi 51 52log_onexit cleanup 53log_assert "Run the tests for mmap_sync" 54 55read -r saved_vm_dirty_expire_centisecs < /proc/sys/vm/dirty_expire_centisecs 56read -r saved_vm_dirty_background_ratio < /proc/sys/vm/dirty_background_ratio 57read -r saved_vm_dirty_writeback_centisecs < /proc/sys/vm/dirty_writeback_centisecs 58 59log_must eval "echo 1 > /proc/sys/vm/dirty_expire_centisecs" 60log_must eval "echo 1 > /proc/sys/vm/dirty_background_bytes" 61log_must eval "echo 1 > /proc/sys/vm/dirty_writeback_centisecs" 62 63log_must mmap_sync 64log_pass "mmap_sync tests passed." 65