2 * Copyright (c) 2009 The DragonFly Project. All rights reserved.
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 static void rebalance_usage(int exit_code);
40 * rebalance <filesystem> [saturation_percentage] (default 85%)
43 hammer_cmd_rebalance(char **av, int ac)
45 struct hammer_ioc_rebalance rebal;
46 const char *filesystem;
53 bzero(&rebal, sizeof(rebal));
55 rebal.key_beg.localization = HAMMER_MIN_LOCALIZATION;
56 rebal.key_beg.obj_id = HAMMER_MIN_OBJID;
57 hammer_get_cycle(&rebal.key_beg, NULL);
59 rebal.key_end.localization = HAMMER_MAX_LOCALIZATION;
60 rebal.key_end.obj_id = HAMMER_MAX_OBJID;
68 perc = strtol(av[1], NULL, 0);
69 if (perc < 50 || perc > 100)
72 rebal.saturation = HAMMER_BTREE_INT_ELMS * perc / 100;
74 printf("rebalance start %016jx:%04x\n",
75 (uintmax_t)rebal.key_beg.obj_id,
76 rebal.key_beg.localization);
78 fd = open(filesystem, O_RDONLY);
80 err(1, "Unable to open %s", filesystem);
82 if (ioctl(fd, HAMMERIOC_REBALANCE, &rebal) < 0) {
83 printf("Rebalance %s failed: %s\n",
84 filesystem, strerror(errno));
85 } else if (rebal.head.flags & HAMMER_IOC_HEAD_INTR) {
86 printf("Rebalance %s interrupted by timer at %016jx:%04x\n",
88 (uintmax_t)rebal.key_cur.obj_id,
89 rebal.key_cur.localization);
91 hammer_set_cycle(&rebal.key_cur, 0);
96 printf("Rebalance %s succeeded\n", filesystem);
100 printf("Rebalance:\n"
101 " %jd btree nodes scanned\n"
102 " %jd btree nodes deleted\n"
103 " %jd collision retries\n"
104 " %jd btree nodes rebalanced\n",
105 (intmax_t)rebal.stat_ncount,
106 (intmax_t)rebal.stat_deletions,
107 (intmax_t)rebal.stat_collisions,
108 (intmax_t)rebal.stat_nrebal
114 rebalance_usage(int exit_code)
117 "hammer rebalance <filesystem> [saturation_percentage]\n"
118 "saturation_percentage is 50%%-100%%, default is 85%%.\n");