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Add a central location for exclusion checks. We check

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here if function is excluded from FBT instrumentation.

Reviewed by:	andrew, emaste, markj
Differential Revision:	https://reviews.freebsd.org/D2899
This commit is contained in:
Ruslan Bukin 2015-07-01 14:09:59 +00:00
parent 27e54fb59e
commit 0ff41755cd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=285004
2 changed files with 32 additions and 0 deletions
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31
sys/cddl/dev/fbt/fbt.c
View File

@ -111,6 +111,37 @@ static struct cdev *fbt_cdev;
static int fbt_probetab_size;
static int fbt_verbose = 0;
int
fbt_excluded(const char *name)
{
if (strncmp(name, "dtrace_", 7) == 0 &&
strncmp(name, "dtrace_safe_", 12) != 0) {
/*
* Anything beginning with "dtrace_" may be called
* from probe context unless it explicitly indicates
* that it won't be called from probe context by
* using the prefix "dtrace_safe_".
*/
return (1);
}
/* Exclude some internal functions */
if (name[0] == '_' && name[1] == '_')
return (1);
/*
* When DTrace is built into the kernel we need to exclude
* the FBT functions from instrumentation.
*/
#ifndef _KLD_MODULE
if (strncmp(name, "fbt_", 4) == 0)
return (1);
#endif
return (0);
}
static void
fbt_doubletrap(void)
{

1
sys/cddl/dev/fbt/fbt.h
View File

@ -58,6 +58,7 @@ int fbt_invop(uintptr_t, uintptr_t *, uintptr_t);
void fbt_patch_tracepoint(fbt_probe_t *, fbt_patchval_t);
int fbt_provide_module_function(struct linker_file *, int,
struct linker_symval *, void *);
int fbt_excluded(const char *name);
extern dtrace_provider_id_t fbt_id;
extern fbt_probe_t **fbt_probetab;