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Message-Id: <1380922788-23112-7-git-send-email-andi@firstfloor.org> Date: Fri, 4 Oct 2013 14:39:48 -0700 From: Andi Kleen <andi@...stfloor.org> To: x86@...nel.org Cc: linux-kernel@...r.kernel.org, peterz@...radead.org, Andi Kleen <ak@...ux.intel.com>, fweisbec@...il.com Subject: [PATCH 6/6] x86: Allow disabling HW_BREAKPOINTS and PERF_EVENTS From: Andi Kleen <ak@...ux.intel.com> As suggested by Ingo. Make HW_BREAKPOINTS a config option. HW_BREAKPOINTS depends on perf. This allows disabling PERF_EVENTS for systems that don't need it (e.g. anything not used for development) Disabling PERF_EVENTS saves over 700k of kernel text (~5% of my config) and significant data/bss: text data bss dec hex filename 13692640 1922416 1478656 17093712 104d450 obj/vmlinux 12980092 1787544 1470464 16238100 f7c614 obj-noperf/vmlinux I didn't make it depend on CONFIG_EXPERT for now, as the system should be very usable even without it. To actually disable perf a couple of options depending on it need to be disabled, including KVM and HW_BREAKPOINTS. Longer term it would be probably nice to have modular perf. Cc: fweisbec@...il.com Cc: peterz@...radead.org Signed-off-by: Andi Kleen <ak@...ux.intel.com> --- arch/x86/Kconfig | 11 ++++++++--- arch/x86/kernel/Makefile | 3 ++- arch/x86/kvm/Kconfig | 1 + 3 files changed, 11 insertions(+), 4 deletions(-) diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index c9d2b81..a8418ed 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -67,9 +67,6 @@ config X86 select HAVE_KERNEL_XZ select HAVE_KERNEL_LZO select HAVE_KERNEL_LZ4 - select HAVE_HW_BREAKPOINT - select HAVE_MIXED_BREAKPOINTS_REGS - select PERF_EVENTS select HAVE_PERF_EVENTS_NMI select HAVE_PERF_REGS select HAVE_PERF_USER_STACK_DUMP @@ -602,6 +599,14 @@ config SCHED_OMIT_FRAME_POINTER If in doubt, say "Y". +config HW_BREAKPOINTS + bool "Enable hardware breakpoints support" + select HAVE_HW_BREAKPOINT + select HAVE_MIXED_BREAKPOINTS_REGS + ---help--- + Enable support for x86 hardware breakpoints for debuggers + and perf. This will implicitly enable perf-events. + menuconfig HYPERVISOR_GUEST bool "Linux guest support" ---help--- diff --git a/arch/x86/kernel/Makefile b/arch/x86/kernel/Makefile index a5408b9..1b09567 100644 --- a/arch/x86/kernel/Makefile +++ b/arch/x86/kernel/Makefile @@ -31,7 +31,7 @@ obj-$(CONFIG_X86_64) += vsyscall_64.o obj-$(CONFIG_X86_64) += vsyscall_emu_64.o obj-y += bootflag.o e820.o obj-y += pci-dma.o quirks.o topology.o kdebugfs.o -obj-y += alternative.o i8253.o pci-nommu.o hw_breakpoint.o +obj-y += alternative.o i8253.o pci-nommu.o obj-y += tsc.o io_delay.o rtc.o obj-y += pci-iommu_table.o obj-y += resource.o @@ -73,6 +73,7 @@ obj-$(CONFIG_DOUBLEFAULT) += doublefault.o obj-$(CONFIG_KGDB) += kgdb.o obj-$(CONFIG_VM86) += vm86_32.o obj-$(CONFIG_EARLY_PRINTK) += early_printk.o +obj-$(CONFIG_HW_BREAKPOINTS) += hw_breakpoint.o obj-$(CONFIG_HPET_TIMER) += hpet.o obj-$(CONFIG_APB_TIMER) += apb_timer.o diff --git a/arch/x86/kvm/Kconfig b/arch/x86/kvm/Kconfig index a47a3e5..de4190a 100644 --- a/arch/x86/kvm/Kconfig +++ b/arch/x86/kvm/Kconfig @@ -36,6 +36,7 @@ config KVM select TASKSTATS select TASK_DELAY_ACCT select PERF_EVENTS + select HW_BREAKPOINTS select HAVE_KVM_MSI select HAVE_KVM_CPU_RELAX_INTERCEPT ---help--- -- 1.8.3.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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