kernel/linux.git/arch/x86/include/asm/trace, branch v6.19.11

x86/fpu: Remove unused trace events

2025-05-31T07:40:40+00:00

The following trace events are not used and defining them just wastes memory: x86_fpu_before_restore x86_fpu_after_restore x86_fpu_init_state Simply remove them. Signed-off-by: Steven Rostedt (Google) Signed-off-by: Ingo Molnar Cc: H. Peter Anvin Cc: Dave Hansen Cc: Linux Trace Kernel Cc: Masami Hiramatsu Cc: Mathieu Desnoyers Cc: Oleg Nesterov Link: https://lore.kernel.org/all/20250529130138.544ffec4@gandalf.local.home # background Link: https://lore.kernel.org/r/20250529131024.7c2ef96f@gandalf.local.home # x86 submission

Merge tag 'x86-debug-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2025-05-27T04:18:59+00:00

Pull x86 debug updates from Ingo Molnar: "Move the x86 page fault tracepoints to generic code, because other architectures would like to make use of them as well" * tag 'x86-debug-2025-05-25' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/tracing, x86/mm: Move page fault tracepoints to generic x86/tracing, x86/mm: Remove redundant trace_pagefault_key

x86/tracing, x86/mm: Move page fault tracepoints to generic

2025-05-16T08:13:59+00:00

Page fault tracepoints are interesting for other architectures as well. Move them to be generic. Signed-off-by: Nam Cao Signed-off-by: Ingo Molnar Cc: Dave Hansen Cc: Gabriele Monaco Cc: H. Peter Anvin Cc: John Ogness Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Steven Rostedt Cc: linux-trace-kernel@vger.kernel.org Link: https://lore.kernel.org/r/89c2f284adf9b4c933f0e65811c50cef900a5a95.1747046848.git.namcao@linutronix.de

x86/tracing, x86/mm: Remove redundant trace_pagefault_key

2025-05-16T08:13:59+00:00

trace_pagefault_key is used to optimize the pagefault tracepoints when it is disabled. However, tracepoints already have built-in static_key for this exact purpose. Remove this redundant key. Signed-off-by: Nam Cao Signed-off-by: Ingo Molnar Cc: Dave Hansen Cc: Gabriele Monaco Cc: H. Peter Anvin Cc: John Ogness Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Steven Rostedt Cc: linux-trace-kernel@vger.kernel.org Link: https://lore.kernel.org/r/827c7666d2989f08742a4fb869b1ed5bfaaf1dbf.1747046848.git.namcao@linutronix.de

x86/fpu: Remove DEFINE_EVENT(x86_fpu, x86_fpu_copy_src)

2025-05-04T08:29:25+00:00

trace_x86_fpu_copy_src() has no users after: 22aafe3bcb67 ("x86/fpu: Remove init_task FPU state dependencies, add debugging warning for PF_KTHREAD tasks") Remove the event. Signed-off-by: Oleg Nesterov Signed-off-by: Ingo Molnar Cc: Chang S . Bae Cc: H. Peter Anvin Cc: Andy Lutomirski Cc: Brian Gerst Cc: Linus Torvalds Cc: Peter Zijlstra Link: https://lore.kernel.org/r/20250503143843.GA8989@redhat.com

x86/fpu: Convert tracing to fpstate

2021-10-20T20:35:04+00:00

Convert FPU tracing code to the new register storage mechanism in preparation for dynamically sized buffers. No functional change. Signed-off-by: Thomas Gleixner Signed-off-by: Borislav Petkov Link: https://lkml.kernel.org/r/20211013145322.503327333@linutronix.de

x86/mm/tlb: Flush remote and local TLBs concurrently

2021-03-06T11:59:10+00:00

To improve TLB shootdown performance, flush the remote and local TLBs concurrently. Introduce flush_tlb_multi() that does so. Introduce paravirtual versions of flush_tlb_multi() for KVM, Xen and hyper-v (Xen and hyper-v are only compile-tested). While the updated smp infrastructure is capable of running a function on a single local core, it is not optimized for this case. The multiple function calls and the indirect branch introduce some overhead, and might make local TLB flushes slower than they were before the recent changes. Before calling the SMP infrastructure, check if only a local TLB flush is needed to restore the lost performance in this common case. This requires to check mm_cpumask() one more time, but unless this mask is updated very frequently, this should impact performance negatively. Signed-off-by: Nadav Amit Signed-off-by: Ingo Molnar Reviewed-by: Michael Kelley # Hyper-v parts Reviewed-by: Juergen Gross # Xen and paravirt parts Reviewed-by: Dave Hansen Link: https://lore.kernel.org/r/20210220231712.2475218-5-namit@vmware.com

x86/entry: Convert reschedule interrupt to IDTENTRY_SYSVEC_SIMPLE

2020-06-11T13:15:16+00:00

The scheduler IPI does not need the full interrupt entry handling logic when the entry is from kernel mode. Use IDTENTRY_SYSVEC_SIMPLE and spare all the overhead. Signed-off-by: Thomas Gleixner Signed-off-by: Ingo Molnar Acked-by: Andy Lutomirski Link: https://lore.kernel.org/r/20200521202119.835425642@linutronix.de

Merge tag 'mpx-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx

2020-01-31T00:11:50+00:00

Pull x86 MPX removal from Dave Hansen: "MPX requires recompiling applications, which requires compiler support. Unfortunately, GCC 9.1 is expected to be be released without support for MPX. This means that there was only a relatively small window where folks could have ever used MPX. It failed to gain wide adoption in the industry, and Linux was the only mainstream OS to ever support it widely. Support for the feature may also disappear on future processors. This set completes the process that we started during the 5.4 merge window when the MPX prctl()s were removed. XSAVE support is left in place, which allows MPX-using KVM guests to continue to function" * tag 'mpx-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/daveh/x86-mpx: x86/mpx: remove MPX from arch/x86 mm: remove arch_bprm_mm_init() hook x86/mpx: remove bounds exception code x86/mpx: remove build infrastructure x86/alternatives: add missing insn.h include

x86/mpx: remove MPX from arch/x86

2020-01-23T18:41:20+00:00

From: Dave Hansen MPX is being removed from the kernel due to a lack of support in the toolchain going forward (gcc). This removes all the remaining (dead at this point) MPX handling code remaining in the tree. The only remaining code is the XSAVE support for MPX state which is currently needd for KVM to handle VMs which might use MPX. Cc: Peter Zijlstra (Intel) Cc: Andy Lutomirski Cc: x86@kernel.org Cc: Linus Torvalds Cc: Andrew Morton Signed-off-by: Dave Hansen