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Add an SDT provider for "vnet"s along with probes for vnet_alloc

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and vnet_destroy.
Use the line number rather than NULL as dummy argument.

Note: the fbt provider does not reliably provide :return probes
(depending on optimization levels used at compile time) making
it unusable for scripts to generate complete call-traces with
well defined boundaries over allocations or destructions of
virtual network stacks.

Sponsored by:	ISPsystem
MFC After:	8 days
This commit is contained in:
Bjoern A. Zeeb 2010-02-09 22:15:59 +00:00
parent fffb9f1d9c
commit 61d033d436
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=203727
1 changed files with 14 additions and 0 deletions
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14
sys/net/vnet.c
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@ -38,11 +38,13 @@ __FBSDID("$FreeBSD$");
#include "opt_ddb.h"
#include "opt_kdb.h"
#include "opt_kdtrace.h"
#include <sys/param.h>
#include <sys/kdb.h>
#include <sys/kernel.h>
#include <sys/jail.h>
#include <sys/sdt.h>
#include <sys/systm.h>
#include <sys/sysctl.h>
#include <sys/linker_set.h>
@ -210,6 +212,13 @@ static TAILQ_HEAD(, vnet_data_free) vnet_data_free_head =
TAILQ_HEAD_INITIALIZER(vnet_data_free_head);
static struct sx vnet_data_free_lock;
SDT_PROVIDER_DEFINE(vnet);
SDT_PROBE_DEFINE1(vnet, functions, vnet_alloc, entry, "int");
SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, alloc, "int", "struct vnet *");
SDT_PROBE_DEFINE2(vnet, functions, vnet_alloc, return, "int", "struct vnet *");
SDT_PROBE_DEFINE2(vnet, functions, vnet_destroy, entry, "int", "struct vnet *");
SDT_PROBE_DEFINE1(vnet, functions, vnet_destroy, return, "int");
/*
* Allocate a virtual network stack.
*/
@ -218,8 +227,10 @@ vnet_alloc(void)
{
struct vnet *vnet;
SDT_PROBE1(vnet, functions, vnet_alloc, entry, __LINE__);
vnet = malloc(sizeof(struct vnet), M_VNET, M_WAITOK | M_ZERO);
vnet->vnet_magic_n = VNET_MAGIC_N;
SDT_PROBE2(vnet, functions, vnet_alloc, alloc, __LINE__, vnet);
/*
* Allocate storage for virtualized global variables and copy in
@ -244,6 +255,7 @@ vnet_alloc(void)
LIST_INSERT_HEAD(&vnet_head, vnet, vnet_le);
VNET_LIST_WUNLOCK();
SDT_PROBE2(vnet, functions, vnet_alloc, return, __LINE__, vnet);
return (vnet);
}
@ -255,6 +267,7 @@ vnet_destroy(struct vnet *vnet)
{
struct ifnet *ifp, *nifp;
SDT_PROBE2(vnet, functions, vnet_destroy, entry, __LINE__, vnet);
KASSERT(vnet->vnet_sockcnt == 0,
("%s: vnet still has sockets", __func__));
@ -281,6 +294,7 @@ vnet_destroy(struct vnet *vnet)
vnet->vnet_data_base = 0;
vnet->vnet_magic_n = 0xdeadbeef;
free(vnet, M_VNET);
SDT_PROBE1(vnet, functions, vnet_destroy, return, __LINE__);
}
/*