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320f0c6022
The purpose of this PR is to accepts fadvise ioctl from userland to do read-ahead by demand. It could dramatically improve sequential read performance especially when primarycache is set to metadata or zfs_prefetch_disable is 1. If the file is mmaped, generic_fadvise is also called for page cache read-ahead besides dmu_prefetch. Only POSIX_FADV_WILLNEED and POSIX_FADV_SEQUENTIAL are supported in this PR currently. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Finix Yan <yancw@info2soft.com> Closes #13694
98 lines
2.0 KiB
C
98 lines
2.0 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or https://opensource.org/licenses/CDDL-1.0.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2007 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2022 by Information2 Software, Inc. All rights reserved.
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*/
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#include "file_common.h"
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#include <sys/types.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <string.h>
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/*
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* Call fadvise to prefetch data
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*/
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static const char *execname = "file_fadvise";
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static void
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usage(void)
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{
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(void) fprintf(stderr,
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"usage: %s -f filename -a advise \n", execname);
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}
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int
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main(int argc, char *argv[])
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{
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char *filename = NULL;
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int advise = 0;
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int fd, ch;
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int err = 0;
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while ((ch = getopt(argc, argv, "a:f:")) != EOF) {
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switch (ch) {
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case 'a':
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advise = atoll(optarg);
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break;
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case 'f':
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filename = optarg;
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break;
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case '?':
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(void) printf("unknown arg %c\n", optopt);
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usage();
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break;
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}
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}
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if (!filename) {
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(void) printf("Filename not specified (-f <file>)\n");
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err++;
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}
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if (advise < POSIX_FADV_NORMAL || advise > POSIX_FADV_NOREUSE) {
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(void) printf("advise is invalid\n");
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err++;
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}
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if (err) {
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usage(); /* no return */
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return (1);
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}
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if ((fd = open(filename, O_RDWR, 0666)) < 0) {
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perror("open");
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return (1);
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}
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posix_fadvise(fd, 0, 0, advise);
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close(fd);
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return (0);
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}
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