Author: br Date: Wed Jul 1 14:09:59 2015 New Revision: 285004 URL: https://svnweb.freebsd.org/changeset/base/285004
Log: Add a central location for exclusion checks. We check here if function is excluded from FBT instrumentation. Reviewed by: andrew, emaste, markj Differential Revision: https://reviews.freebsd.org/D2899 Modified: head/sys/cddl/dev/fbt/fbt.c head/sys/cddl/dev/fbt/fbt.h Modified: head/sys/cddl/dev/fbt/fbt.c ============================================================================== --- head/sys/cddl/dev/fbt/fbt.c Wed Jul 1 13:59:26 2015 (r285003) +++ head/sys/cddl/dev/fbt/fbt.c Wed Jul 1 14:09:59 2015 (r285004) @@ -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) { Modified: head/sys/cddl/dev/fbt/fbt.h ============================================================================== --- head/sys/cddl/dev/fbt/fbt.h Wed Jul 1 13:59:26 2015 (r285003) +++ head/sys/cddl/dev/fbt/fbt.h Wed Jul 1 14:09:59 2015 (r285004) @@ -58,6 +58,7 @@ int fbt_invop(uintptr_t, uintptr_t *, ui 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; _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
