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| author | Josh Stone <joshua.i.stone@intel.com> | 2008-05-23 20:35:55 -0700 |
|---|---|---|
| committer | Josh Stone <joshua.i.stone@intel.com> | 2008-05-27 16:19:03 -0700 |
| commit | 2cda5f46cba978e19590efd7fee0b3075f8eb8df (patch) | |
| tree | d613226eb1fe124643018b5e4c45f7019df635ea /buildrun.cxx | |
| parent | a2eab6ee228991f3ebfa5f628857ec6c703c85d1 (diff) | |
| download | systemtap-steved-2cda5f46cba978e19590efd7fee0b3075f8eb8df.tar.gz systemtap-steved-2cda5f46cba978e19590efd7fee0b3075f8eb8df.tar.xz systemtap-steved-2cda5f46cba978e19590efd7fee0b3075f8eb8df.zip | |
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.
Diffstat (limited to 'buildrun.cxx')
| -rw-r--r-- | buildrun.cxx | 6 |
1 files changed, 6 insertions, 0 deletions
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<s.macros.size(); i++) o << "EXTRA_CFLAGS += -D " << lex_cast_qstring(s.macros[i]) << endl; |