68 lines
2.9 KiB
Diff
68 lines
2.9 KiB
Diff
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From 0e0c0bf488c7e01bde16b2f8e0c757baab0effaf Mon Sep 17 00:00:00 2001
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From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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Date: Thu, 4 Feb 2016 14:08:06 +0100
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Subject: [PATCH 062/365] latencyhist: disable jump-labels
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Atleast on X86 we die a recursive death
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|CPU: 3 PID: 585 Comm: bash Not tainted 4.4.1-rt4+ #198
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|Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS Debian-1.8.2-1 04/01/2014
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|task: ffff88007ab4cd00 ti: ffff88007ab94000 task.ti: ffff88007ab94000
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|RIP: 0010:[<ffffffff81684870>] [<ffffffff81684870>] int3+0x0/0x10
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|RSP: 0018:ffff88013c107fd8 EFLAGS: 00010082
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|RAX: ffff88007ab4cd00 RBX: ffffffff8100ceab RCX: 0000000080202001
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|RDX: 0000000000000000 RSI: ffffffff8100ceab RDI: ffffffff810c78b2
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|RBP: ffff88007ab97c10 R08: ffffffffff57b000 R09: 0000000000000000
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|R10: ffff88013bb64790 R11: ffff88007ab4cd68 R12: ffffffff8100ceab
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|R13: ffffffff810c78b2 R14: ffffffff810f8158 R15: ffffffff810f9120
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|FS: 0000000000000000(0000) GS:ffff88013c100000(0063) knlGS:00000000f74e3940
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|CS: 0010 DS: 002b ES: 002b CR0: 000000008005003b
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|CR2: 0000000008cf6008 CR3: 000000013b169000 CR4: 00000000000006e0
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|Call Trace:
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| <#DB>
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| [<ffffffff810f8158>] ? trace_preempt_off+0x18/0x170
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| <<EOE>>
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| [<ffffffff81077745>] preempt_count_add+0xa5/0xc0
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| [<ffffffff810c78b2>] on_each_cpu+0x22/0x90
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| [<ffffffff8100ceab>] text_poke_bp+0x5b/0xc0
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| [<ffffffff8100a29c>] arch_jump_label_transform+0x8c/0xf0
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| [<ffffffff8111c77c>] __jump_label_update+0x6c/0x80
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| [<ffffffff8111c83a>] jump_label_update+0xaa/0xc0
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| [<ffffffff8111ca54>] static_key_slow_inc+0x94/0xa0
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| [<ffffffff810e0d8d>] tracepoint_probe_register_prio+0x26d/0x2c0
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| [<ffffffff810e0df3>] tracepoint_probe_register+0x13/0x20
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| [<ffffffff810fca78>] trace_event_reg+0x98/0xd0
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| [<ffffffff810fcc8b>] __ftrace_event_enable_disable+0x6b/0x180
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| [<ffffffff810fd5b8>] event_enable_write+0x78/0xc0
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| [<ffffffff8117a768>] __vfs_write+0x28/0xe0
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| [<ffffffff8117b025>] vfs_write+0xa5/0x180
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| [<ffffffff8117bb76>] SyS_write+0x46/0xa0
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| [<ffffffff81002c91>] do_fast_syscall_32+0xa1/0x1d0
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| [<ffffffff81684d57>] sysenter_flags_fixed+0xd/0x17
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during
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echo 1 > /sys/kernel/debug/tracing/events/hist/preemptirqsoff_hist/enable
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Reported-By: Christoph Mathys <eraserix@gmail.com>
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Cc: stable-rt@vger.kernel.org
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Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
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---
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arch/Kconfig | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/arch/Kconfig b/arch/Kconfig
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index 2fa953f81ffb..391ecd54fffa 100644
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--- a/arch/Kconfig
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+++ b/arch/Kconfig
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@@ -55,6 +55,7 @@ config KPROBES
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config JUMP_LABEL
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bool "Optimize very unlikely/likely branches"
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depends on HAVE_ARCH_JUMP_LABEL
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+ depends on (!INTERRUPT_OFF_HIST && !PREEMPT_OFF_HIST && !WAKEUP_LATENCY_HIST && !MISSED_TIMER_OFFSETS_HIST)
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help
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This option enables a transparent branch optimization that
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makes certain almost-always-true or almost-always-false branch
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--
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2.28.0
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