tests/zfs-tests/tests/functional/arc/dbufstats_002_pos.ksh

   1 #!/bin/ksh -p
   2 #
   3 # CDDL HEADER START
   4 #
   5 # The contents of this file are subject to the terms of the
   6 # Common Development and Distribution License (the "License").
   7 # You may not use this file except in compliance with the License.
   8 #
   9 # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10 # or http://www.opensolaris.org/os/licensing.
  11 # See the License for the specific language governing permissions
  12 # and limitations under the License.
  13 #
  14 # When distributing Covered Code, include this CDDL HEADER in each
  15 # file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16 # If applicable, add the following below this CDDL HEADER, with the
  17 # fields enclosed by brackets "[]" replaced with your own identifying
  18 # information: Portions Copyright [yyyy] [name of copyright owner]
  19 #
  20 # CDDL HEADER END
  21 #
  22
  23 #
  24 # Copyright (c) 2017, Lawrence Livermore National Security, LLC.
  25 #
  26
  27 . $STF_SUITE/include/libtest.shlib
  28 . $STF_SUITE/include/math.shlib
  29
  30 #
  31 # DESCRIPTION:
  32 # Ensure that dbufs move from mru to mfu as expected.
  33 #
  34 # STRATEGY:
  35 # 1. Set dbuf cache size to a small size (10M for this test)
  36 # 2. Generate a file with random data (small enough to fit in cache)
  37 # 3. zpool sync to remove dbufs from anon list in ARC
  38 # 4. Obtain the object ID using linux stat command
  39 # 5. Ensure that all dbufs are on the mru list in the ARC
  40 # 6. Generate another random file large enough to flush dbuf cache
  41 # 7. cat the first generated file
  42 # 8. Ensure that at least some dbufs moved to the mfu list in the ARC
  43 #
  44
  45 DBUFS_FILE=$(mktemp $TEST_BASE_DIR/dbufs.out.XXXXXX)
  46
  47 function cleanup
  48 {
  49         log_must rm -f $TESTDIR/file $TESTDIR/file2 $DBUFS_FILE
  50 }
  51
  52 verify_runnable "both"
  53
  54 log_assert "dbufs move from mru to mfu list"
  55
  56 log_onexit cleanup
  57
  58 log_must file_write -o create -f "$TESTDIR/file" -b 1048576 -c 1 -d R
  59 sync_all_pools
  60
  61 objid=$(get_objnum "$TESTDIR/file")
  62 log_note "Object ID for $TESTDIR/file is $objid"
  63
  64 log_must eval "kstat dbufs > $DBUFS_FILE"
  65 dbuf=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid" | wc -l)
  66 mru=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=1" | wc -l)
  67 mfu=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=3" | wc -l)
  68 log_note "dbuf count is $dbuf, mru count is $mru, mfu count is $mfu"
  69 verify_ne "0" "$mru" "mru count"
  70 verify_eq "0" "$mfu" "mfu count"
  71
  72 log_must eval "cat $TESTDIR/file > /dev/null"
  73 log_must eval "kstat dbufs > $DBUFS_FILE"
  74 dbuf=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid" | wc -l)
  75 mru=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=1" | wc -l)
  76 mfu=$(dbufstat -bxn -i "$DBUFS_FILE" -F "object=$objid,list=3" | wc -l)
  77 log_note "dbuf count is $dbuf, mru count is $mru, mfu count is $mfu"
  78 verify_ne "0" "$mfu" "mfu count"
  79
  80 log_pass "dbufs move from mru to mfu list passed"