1#!/usr/sbin/dtrace -s 2/* 3 * fspaging.d - file system read/write and paging tracing. 4 * Written using DTrace (Solaris 10 3/05) 5 * 6 * This traces file related activity: system call reads and writes, 7 * vnode logical read and writes (fop), vnode putpage and getpage activity, 8 * and disk I/O. It can be used to examine the behaviour of each I/O 9 * layer, from the syscall interface to what the disk is doing. Behaviour 10 * such as read-ahead, and max I/O size breakup can be observed. 11 * 12 * This is a verbose version of fsrw.d, as this also traces paging activity. 13 * 14 * 23-Apr-2006, ver 0.50 15 * 16 * USAGE: fspaging.d 17 * 18 * FIELDS: 19 * Event Traced event (see EVENTS below) 20 * Device Device, for disk I/O 21 * RW Either Read or Write 22 * Size Size of I/O in bytes, if known 23 * Offset Offset of I/O in kilobytes, if known 24 * Path Path to file on disk 25 * 26 * EVENTS: 27 * sc-read System call read 28 * sc-write System call write 29 * fop_read Logical read 30 * fop_write Logical write 31 * fop_getpage Logical get page 32 * fop_putpage Logical put page 33 * disk_io Physical disk I/O 34 * disk_ra Physical disk I/O, read ahead 35 * 36 * The events are drawn with a level of indentation, which can sometimes 37 * help identify related events. 38 * 39 * SEE ALSO: fsrw.d 40 * 41 * IDEA: Richard McDougall, Solaris Internals 2nd Ed, FS Chapter. 42 * 43 * COPYRIGHT: Copyright (c) 2006 Brendan Gregg. 44 * 45 * CDDL HEADER START 46 * 47 * The contents of this file are subject to the terms of the 48 * Common Development and Distribution License, Version 1.0 only 49 * (the "License"). You may not use this file except in compliance 50 * with the License. 51 * 52 * You can obtain a copy of the license at Docs/cddl1.txt 53 * or http://www.opensolaris.org/os/licensing. 54 * See the License for the specific language governing permissions 55 * and limitations under the License. 56 * 57 * CDDL HEADER END 58 * 59 * ToDo: readv() 60 * 61 * 20-Mar-2006 Brendan Gregg Created this. 62 */ 63 64#pragma D option quiet 65#pragma D option switchrate=10hz 66 67dtrace:::BEGIN 68{ 69 printf("%-13s %10s %2s %8s %6s %s\n", 70 "Event", "Device", "RW", "Size", "Offset", "Path"); 71} 72 73syscall::*read:entry, 74syscall::*write*:entry 75{ 76 /* 77 * starting with a file descriptior, dig out useful info 78 * from the corresponding file_t and vnode_t. 79 */ 80 this->filistp = curthread->t_procp->p_user.u_finfo.fi_list; 81 this->ufentryp = (uf_entry_t *)((uint64_t)this->filistp + 82 (uint64_t)arg0 * (uint64_t)sizeof (uf_entry_t)); 83 this->filep = this->ufentryp->uf_file; 84 self->offset = this->filep->f_offset; 85 this->vnodep = this->filep != 0 ? this->filep->f_vnode : 0; 86 self->vpath = this->vnodep ? (this->vnodep->v_path != 0 ? 87 cleanpath(this->vnodep->v_path) : "<unknown>") : "<unknown>"; 88 self->sc_trace = this->vnodep ? this->vnodep->v_type == 1 || 89 this->vnodep->v_type == 2 ? 1 : 0 : 0; 90} 91 92syscall::*read:entry 93/self->sc_trace/ 94{ 95 printf("sc-%-10s %10s %2s %8d %6d %s\n", probefunc, ".", "R", 96 (int)arg2, self->offset / 1024, self->vpath); 97} 98 99syscall::*write*:entry 100/self->sc_trace/ 101{ 102 printf("sc-%-10s %10s %2s %8d %6d %s\n", probefunc, ".", "W", 103 (int)arg2, self->offset / 1024, self->vpath); 104} 105 106syscall::*read:return, 107syscall::*write*:return 108{ 109 self->vpath = 0; 110 self->offset = 0; 111 self->sc_trace = 0; 112} 113 114fbt::fop_putpage:entry, 115fbt::fop_getpage:entry 116/self->sc_trace && args[0]->v_path/ 117{ 118 printf(" %-11s %10s %2s %8d %6d %s\n", probefunc, ".", 119 probefunc == "fop_getpage" ? "R" : "W", (uint64_t)arg2, 120 args[1] / 1024, cleanpath(args[0]->v_path)); 121} 122 123 124fbt::fop_read:entry, 125fbt::fop_write:entry 126/self->sc_trace && args[0]->v_path/ 127{ 128 printf(" %-11s %10s %2s %8d %6d %s\n", probefunc, ".", 129 probefunc == "fop_read" ? "R" : "W", args[1]->uio_resid, 130 args[1]->_uio_offset._f / 1024, cleanpath(args[0]->v_path)); 131} 132 133fbt:ufs:ufs_getpage_ra:entry 134{ 135 /* fetch the real offset (file_t is unaware of this) */ 136 self->offset = ((inode_t *)args[0]->v_data)->i_nextrio; 137 self->read_ahead = 1; 138} 139 140fbt:ufs:ufs_getpage_ra:return 141{ 142 self->read_ahead = 0; 143 self->offset = 0; 144} 145 146io::bdev_strategy:start 147{ 148 this->offset = self->read_ahead ? self->offset : args[2]->fi_offset; 149 printf(" %-9s %10s %2s %8d %6d %s\n", 150 self->read_ahead ? "disk_ra" : "disk_io", args[1]->dev_statname, 151 args[0]->b_flags & B_READ ? "R" : "W", args[0]->b_bcount, 152 this->offset / 1024, args[2]->fi_pathname); 153} 154