#!/bin/ksh -p # # CDDL HEADER START # # The contents of this file are subject to the terms of the # Common Development and Distribution License (the "License"). # You may not use this file except in compliance with the License. # # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE # or http://www.opensolaris.org/os/licensing. # See the License for the specific language governing permissions # and limitations under the License. # # When distributing Covered Code, include this CDDL HEADER in each # file and include the License file at usr/src/OPENSOLARIS.LICENSE. # If applicable, add the following below this CDDL HEADER, with the # fields enclosed by brackets "[]" replaced with your own identifying # information: Portions Copyright [yyyy] [name of copyright owner] # # CDDL HEADER END # # # Copyright (c) 2017, Lawrence Livermore National Security, LLC. # . $STF_SUITE/include/libtest.shlib . $STF_SUITE/include/math.shlib # # DESCRIPTION: # Ensure that dbufs move from mru to mfu as expected. # # STRATEGY: # 1. Set dbuf cache size to a small size (10M for this test) # 2. Generate a file with random data (small enough to fit in cache) # 3. zpool sync to remove dbufs from anon list in ARC # 4. Obtain the object ID using linux stat command # 5. Ensure that all dbufs are on the mru list in the ARC # 6. Generate another random file large enough to flush dbuf cache # 7. cat the first generated file # 8. Ensure that at least some dbufs moved to the mfu list in the ARC # DBUFS_FILE=$(mktemp $TEST_BASE_DIR/dbufs.out.XXXXXX) function cleanup { log_must rm -f $TESTDIR/file $TESTDIR/file2 $DBUFS_FILE } verify_runnable "both" log_assert "dbufs move from mru to mfu list" log_onexit cleanup log_must file_write -o create -f "$TESTDIR/file" -b 1048576 -c 1 -d R log_must zpool sync objid=$(get_objnum "$TESTDIR/file") log_note "Object ID for $TESTDIR/file is $objid" log_must eval "kstat dbufs > $DBUFS_FILE" dbuf=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid" | wc -l) mru=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=1" | wc -l) mfu=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=3" | wc -l) log_note "dbuf count is $dbuf, mru count is $mru, mfu count is $mfu" verify_ne "0" "$mru" "mru count" verify_eq "0" "$mfu" "mfu count" log_must eval "cat $TESTDIR/file > /dev/null" log_must eval "kstat dbufs > $DBUFS_FILE" dbuf=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid" | wc -l) mru=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=1" | wc -l) mfu=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=3" | wc -l) log_note "dbuf count is $dbuf, mru count is $mru, mfu count is $mfu" verify_ne "0" "$mfu" "mfu count" log_pass "dbufs move from mru to mfu list passed"