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Add "jid" and "jailname" variables to DTrace.

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These return the jail ID and jail name for the traced process,
respectively, and are analogous to "zonename" on Solaris/illumos.
"zonename" is now aliased to "jailname".

Also add some stress tests for the new variables.

Submitted by:	Domagoj Stolfa <domagoj.stolfa@gmail.com>
Reviewed by:	dteske (previous version)
MFC after:	2 weeks
Sponsored by:	DARPA, AFRL
Differential Revision:	https://reviews.freebsd.org/D13877
This commit is contained in:
Mark Johnston 2018-01-12 19:59:46 +00:00
parent 44c1484a53
commit 224e0c2f61
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=327888
6 changed files with 116 additions and 2 deletions
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44
cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/safety/tst.jailname.d Normal file
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@ -0,0 +1,44 @@
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Domagoj Stolfa <domagoj.stolfa@cl.cam.ac.uk>.
*
* This software was developed by BAE Systems, the University of Cambridge
* Computer Laboratory, and Memorial University under DARPA/AFRL contract
* FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
* (TC) research program.
*
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* ASSERTION:
* collect jailname at every fbt probe and at every firing of a
* high-frequency profile probe
*/
fbt:::
{
@a[jailname] = count();
}
profile-4999hz
{
@a[jailname] = count();
}
tick-1sec
/n++ == 10/
{
exit(0);
}

44
cddl/contrib/opensolaris/cmd/dtrace/test/tst/common/safety/tst.jid.d Normal file
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@ -0,0 +1,44 @@
/*
* This file and its contents are supplied under the terms of the
* Common Development and Distribution License ("CDDL"), version 1.0.
* You may only use this file in accordance with the terms version
* 1.0 of the CDDL.
*
* A full copy of the text of the CDDL should have accompanied this
* source. A copy of the CDDL is also available via the Internet at
* http://www.illumos.org/license/CDDL.
*/
/*
* Copyright 2018 Domagoj Stolfa <domagoj.stolfa@cl.cam.ac.uk>.
*
* This software was developed by BAE Systems, the University of Cambridge
* Computer Laboratory, and Memorial University under DARPA/AFRL contract
* FA8650-15-C-7558 ("CADETS"), as part of the DARPA Transparent Computing
* (TC) research program.
*
*/
#pragma ident "%Z%%M% %I% %E% SMI"
/*
* ASSERTION:
* collect jid at every fbt probe and at every firing of a
* high-frequency profile probe
*/
fbt:::
{
@a[jid] = count();
}
profile-4999hz
{
@a[jid] = count();
}
tick-1sec
/n++ == 10/
{
exit(0);
}

8
cddl/contrib/opensolaris/lib/libdtrace/common/dt_open.c
View File

@ -313,6 +313,12 @@ static const dt_ident_t _dtrace_globals[] = {
DT_VERS_1_5, &dt_idops_func, "string(int, void *)" },
{ "ipl", DT_IDENT_SCALAR, 0, DIF_VAR_IPL, DT_ATTR_STABCMN, DT_VERS_1_0,
&dt_idops_type, "uint_t" },
#ifdef __FreeBSD__
{ "jailname", DT_IDENT_SCALAR, 0, DIF_VAR_JAILNAME,
DT_ATTR_STABCMN, DT_VERS_1_13, &dt_idops_type, "string" },
{ "jid", DT_IDENT_SCALAR, 0, DIF_VAR_JID, DT_ATTR_STABCMN, DT_VERS_1_13,
&dt_idops_type, "int" },
#endif
{ "json", DT_IDENT_FUNC, 0, DIF_SUBR_JSON, DT_ATTR_STABCMN, DT_VERS_1_11,
&dt_idops_func, "string(const char *, const char *)" },
{ "jstack", DT_IDENT_ACTFUNC, 0, DT_ACT_JSTACK, DT_ATTR_STABCMN, DT_VERS_1_0,
@ -528,10 +534,8 @@ static const dt_ident_t _dtrace_globals[] = {
{ "walltimestamp", DT_IDENT_SCALAR, 0, DIF_VAR_WALLTIMESTAMP,
DT_ATTR_STABCMN, DT_VERS_1_0,
&dt_idops_type, "int64_t" },
#ifdef illumos
{ "zonename", DT_IDENT_SCALAR, 0, DIF_VAR_ZONENAME,
DT_ATTR_STABCMN, DT_VERS_1_0, &dt_idops_type, "string" },
#endif
#ifndef illumos
{ "cpu", DT_IDENT_SCALAR, 0, DIF_VAR_CPU,

2
cddl/usr.sbin/dtrace/tests/common/safety/Makefile
View File

@ -19,6 +19,8 @@ ${PACKAGE}FILES= \
tst.gid.d \
tst.hton.d \
tst.index.d \
tst.jailname.d \
tst.jid.d \
tst.msgdsize.d \
tst.msgsize.d \
tst.null.d \

18
sys/cddl/contrib/opensolaris/uts/common/dtrace/dtrace.c
View File

@ -3654,6 +3654,24 @@ dtrace_dif_variable(dtrace_mstate_t *mstate, dtrace_state_t *state, uint64_t v,
return (dtrace_dif_varstr(
(uintptr_t)curthread->t_procp->p_zone->zone_name,
state, mstate));
#elif defined(__FreeBSD__)
/*
* On FreeBSD, we introduce compatibility to zonename by falling through
* into jailname.
*/
case DIF_VAR_JAILNAME:
if (!dtrace_priv_kernel(state))
return (0);
return (dtrace_dif_varstr(
(uintptr_t)curthread->t_procp->p_ucred->cr_prison->pr_name,
state, mstate));
case DIF_VAR_JID:
if (!dtrace_priv_kernel(state))
return (0);
return ((uint64_t)curthread->t_procp->p_ucred->cr_prison->pr_id);
#else
return (0);
#endif

2
sys/cddl/contrib/opensolaris/uts/common/sys/dtrace.h
View File

@ -254,6 +254,8 @@ typedef enum dtrace_probespec {
#define DIF_VAR_GID 0x011f /* process group ID */
#define DIF_VAR_ERRNO 0x0120 /* thread errno */
#define DIF_VAR_EXECARGS 0x0121 /* process arguments */
#define DIF_VAR_JID 0x0122 /* process jail id */
#define DIF_VAR_JAILNAME 0x0123 /* process jail name */
#ifndef illumos
#define DIF_VAR_CPU 0x0200