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Diffstat (limited to 'cddl/contrib/dtracetoolkit/Java/j_flow.d')
-rwxr-xr-x | cddl/contrib/dtracetoolkit/Java/j_flow.d | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/cddl/contrib/dtracetoolkit/Java/j_flow.d b/cddl/contrib/dtracetoolkit/Java/j_flow.d new file mode 100755 index 0000000..e98c067 --- /dev/null +++ b/cddl/contrib/dtracetoolkit/Java/j_flow.d @@ -0,0 +1,87 @@ +#!/usr/sbin/dtrace -Zs +/* + * j_flow.d - snoop Java execution showing method flow using DTrace. + * Written for the Java hotspot DTrace provider. + * + * $Id: j_flow.d 38 2007-09-16 08:17:41Z brendan $ + * + * This traces activity from all Java processes on the system with hotspot + * provider support (1.6.0) and the flag "+ExtendedDTraceProbes". eg, + * java -XX:+ExtendedDTraceProbes classfile + * + * USAGE: j_flow.d # hit Ctrl-C to end + * + * This watches Java method entries and returns, and indents child + * method calls. + * + * FIELDS: + * C CPU-id + * TIME(us) Time since boot, us + * PID Process ID + * CLASS.METHOD Java class and method name + * + * LEGEND: + * -> method entry + * <- method return + * + * WARNING: Watch the first column carefully, it prints the CPU-id. If it + * changes, then it is very likely that the output has been shuffled. + * Changes in TID will appear to shuffle output, as we change from one thread + * depth to the next. See Docs/Notes/ALLjavaflow.txt for additional notes. + * + * COPYRIGHT: Copyright (c) 2007 Brendan Gregg. + * + * CDDL HEADER START + * + * The contents of this file are subject to the terms of the + * Common Development and Distribution License, Version 1.0 only + * (the "License"). You may not use this file except in compliance + * with the License. + * + * You can obtain a copy of the license at Docs/cddl1.txt + * or http://www.opensolaris.org/os/licensing. + * See the License for the specific language governing permissions + * and limitations under the License. + * + * CDDL HEADER END + * + * 09-Sep-2007 Brendan Gregg Created this. + */ + +/* increasing bufsize can reduce drops */ +#pragma D option bufsize=16m +#pragma D option quiet +#pragma D option switchrate=10 + +self int depth[int]; + +dtrace:::BEGIN +{ + printf("%3s %6s %-16s -- %s\n", "C", "PID", "TIME(us)", "CLASS.METHOD"); +} + +hotspot*:::method-entry +{ + this->class = (char *)copyin(arg1, arg2 + 1); + this->class[arg2] = '\0'; + this->method = (char *)copyin(arg3, arg4 + 1); + this->method[arg4] = '\0'; + + printf("%3d %6d %-16d %*s-> %s.%s\n", cpu, pid, timestamp / 1000, + self->depth[arg0] * 2, "", stringof(this->class), + stringof(this->method)); + self->depth[arg0]++; +} + +hotspot*:::method-return +{ + this->class = (char *)copyin(arg1, arg2 + 1); + this->class[arg2] = '\0'; + this->method = (char *)copyin(arg3, arg4 + 1); + this->method[arg4] = '\0'; + + self->depth[arg0] -= self->depth[arg0] > 0 ? 1 : 0; + printf("%3d %6d %-16d %*s<- %s.%s\n", cpu, pid, timestamp / 1000, + self->depth[arg0] * 2, "", stringof(this->class), + stringof(this->method)); +} |