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- 12 Nov, 2008 2 commits
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Steven Rostedt authored
Impact: name change of unlikely tracer and profiler Ingo Molnar suggested changing the config from UNLIKELY_PROFILE to BRANCH_PROFILING. I never did like the "unlikely" name so I went one step farther, and renamed all the unlikely configurations to a "BRANCH" variant. Signed-off-by:
Steven Rostedt <srostedt@redhat.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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Ingo Molnar authored
Impact: fix bootup crash the branch tracer missed arch/x86/vdso/vclock_gettime.c from disabling tracing, which caused such bootup crashes: [ 201.840097] init[1]: segfault at 7fffed3fe7c0 ip 00007fffed3fea2e sp 000077 also clean up the ugly ifdefs in arch/x86/kernel/vsyscall_64.c by creating DISABLE_UNLIKELY_PROFILE facility for code to turn off instrumentation on a per file basis. Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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- 23 May, 2008 2 commits
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Steven Rostedt authored
Add the notrace annotations to the vsyscall functions - there we are not in kernel context yet, so the tracer function cannot (and must not) be called. Signed-off-by:
Steven Rostedt <srostedt@redhat.com> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de>
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Andi Kleen authored
Jeremy's gcc 3.4 seems to be unable to inline a 8 byte memcpy. But the vdso doesn't support external references. Copy the structure members of struct timezone explicitely instead. Signed-off-by:
Andi Kleen <ak@linux.intel.com> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de>
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- 30 Jan, 2008 1 commit
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Lucas Woods authored
Signed-off-by:
Lucas Woods <woodzy@gmail.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Ingo Molnar <mingo@elte.hu> Signed-off-by:
Thomas Gleixner <tglx@linutronix.de>
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- 11 Oct, 2007 1 commit
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Thomas Gleixner authored
Signed-off-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
Ingo Molnar <mingo@elte.hu>
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- 12 Sep, 2007 1 commit
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Andi Kleen authored
vdso vgetns() didn't mask the time source offset calculation, which could lead to time problems with 32bit HPET. Add the masking. Thanks to Chuck Ebbert for tracking this down. Signed-off-by:
Andi Kleen <ak@suse.de> Cc: Chuck Ebbert <cebbert@redhat.com> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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- 22 Jul, 2007 1 commit
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Andi Kleen authored
This implements new vDSO for x86-64. The concept is similar to the existing vDSOs on i386 and PPC. x86-64 has had static vsyscalls before, but these are not flexible enough anymore. A vDSO is a ELF shared library supplied by the kernel that is mapped into user address space. The vDSO mapping is randomized for each process for security reasons. Doing this was needed for clock_gettime, because clock_gettime always needs a syscall fallback and having one at a fixed address would have made buffer overflow exploits too easy to write. The vdso can be disabled with vdso=0 It currently includes a new gettimeofday implemention and optimized clock_gettime(). The gettimeofday implementation is slightly faster than the one in the old vsyscall. clock_gettime is significantly faster than the syscall for CLOCK_MONOTONIC and CLOCK_REALTIME. The new calls are generally faster than the old vsyscall. Advantages over the old x86-64 vsyscalls: - Extensible - Randomized - Cleaner - Easier to virtualize (the old static address range previously causes overhead e.g. for Xen because it has to create special page tables for it) Weak points: - glibc support still to be written The VM interface is partly based on Ingo Molnar's i386 version. Includes compile fix from Joachim Deguara Signed-off-by:
Andi Kleen <ak@suse.de> Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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