From 2cda5f46cba978e19590efd7fee0b3075f8eb8df Mon Sep 17 00:00:00 2001 From: Josh Stone Date: Fri, 23 May 2008 20:35:55 -0700 Subject: Add prototypes for using the 2.6.26 probe_kernel_* functions. For now, the autoconf for the new code is disabled, because it shows poorer performance than our existing dereferencing functions. This is probably because ours get inlined and optimized. The code is being committed so that we may re-evaluate its usefulness in the future. This addresses bugzilla 6432. --- buildrun.cxx | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'buildrun.cxx') diff --git a/buildrun.cxx b/buildrun.cxx index 76efe7c0..a39f2b63 100644 --- a/buildrun.cxx +++ b/buildrun.cxx @@ -96,6 +96,12 @@ compile_pass (systemtap_session& s) o << module_cflags << " += $(call stap_check_build, $(SYSTEMTAP_RUNTIME)/autoconf-nameidata.c, -DSTAPCONF_NAMEIDATA_CLEANUP,)" << endl; o << module_cflags << " += $(call stap_check_build, $(SYSTEMTAP_RUNTIME)/autoconf-unregister-kprobes.c, -DSTAPCONF_UNREGISTER_KPROBES,)" << endl; o << module_cflags << " += $(call stap_check_build, $(SYSTEMTAP_RUNTIME)/autoconf-module-nsections.c, -DSTAPCONF_MODULE_NSECTIONS,)" << endl; +#if 0 + /* NB: For now, the performance hit of probe_kernel_read/write (vs. our + * homegrown safe-access functions) is deemed undesireable, so we'll skip + * this autoconf. */ + o << module_cflags << " += $(call stap_check_build, $(SYSTEMTAP_RUNTIME)/autoconf-probe-kernel.c, -DSTAPCONF_PROBE_KERNEL,)" << endl; +#endif for (unsigned i=0; i