kernel_samsung_sm7125

jenna

History

Steven Rostedt 81d68a96a3 ftrace: trace irq disabled critical timings This patch adds latency tracing for critical timings (how long interrupts are disabled for). "irqsoff" is added to /debugfs/tracing/available_tracers Note: tracing_max_latency also holds the max latency for irqsoff (in usecs). (default to large number so one must start latency tracing) tracing_thresh threshold (in usecs) to always print out if irqs off is detected to be longer than stated here. If irq_thresh is non-zero, then max_irq_latency is ignored. Here's an example of a trace with ftrace_enabled = 0 ======= preemption latency trace v1.1.5 on 2.6.24-rc7 Signed-off-by: Ingo Molnar <mingo@elte.hu> -------------------------------------------------------------------- latency: 100 us, #3/3, CPU#1 \| (M:rt VP:0, KP:0, SP:0 HP:0 #P:2) ----------------- \| task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0) ----------------- => started at: _spin_lock_irqsave+0x2a/0xb7 => ended at: _spin_unlock_irqrestore+0x32/0x5f _------=> CPU# / _-----=> irqs-off \| / _----=> need-resched \|\| / _---=> hardirq/softirq \|\|\| / _--=> preempt-depth \|\|\|\| / \|\|\|\|\| delay cmd pid \|\|\|\|\| time \| caller \ / \|\|\|\|\| \ \| / swapper-0 1d.s3 0us+: _spin_lock_irqsave+0x2a/0xb7 (e1000_update_stats+0x47/0x64c [e1000]) swapper-0 1d.s3 100us : _spin_unlock_irqrestore+0x32/0x5f (e1000_update_stats+0x641/0x64c [e1000]) swapper-0 1d.s3 100us : trace_hardirqs_on_caller+0x75/0x89 (_spin_unlock_irqrestore+0x32/0x5f) vim:ft=help ======= And this is a trace with ftrace_enabled == 1 ======= preemption latency trace v1.1.5 on 2.6.24-rc7 -------------------------------------------------------------------- latency: 102 us, #12/12, CPU#1 \| (M:rt VP:0, KP:0, SP:0 HP:0 #P:2) ----------------- \| task: swapper-0 (uid:0 nice:0 policy:0 rt_prio:0) ----------------- => started at: _spin_lock_irqsave+0x2a/0xb7 => ended at: _spin_unlock_irqrestore+0x32/0x5f _------=> CPU# / _-----=> irqs-off \| / _----=> need-resched \|\| / _---=> hardirq/softirq \|\|\| / _--=> preempt-depth \|\|\|\| / \|\|\|\|\| delay cmd pid \|\|\|\|\| time \| caller \ / \|\|\|\|\| \ \| / swapper-0 1dNs3 0us+: _spin_lock_irqsave+0x2a/0xb7 (e1000_update_stats+0x47/0x64c [e1000]) swapper-0 1dNs3 46us : e1000_read_phy_reg+0x16/0x225 [e1000] (e1000_update_stats+0x5e2/0x64c [e1000]) swapper-0 1dNs3 46us : e1000_swfw_sync_acquire+0x10/0x99 [e1000] (e1000_read_phy_reg+0x49/0x225 [e1000]) swapper-0 1dNs3 46us : e1000_get_hw_eeprom_semaphore+0x12/0xa6 [e1000] (e1000_swfw_sync_acquire+0x36/0x99 [e1000]) swapper-0 1dNs3 47us : __const_udelay+0x9/0x47 (e1000_read_phy_reg+0x116/0x225 [e1000]) swapper-0 1dNs3 47us+: __delay+0x9/0x50 (__const_udelay+0x45/0x47) swapper-0 1dNs3 97us : preempt_schedule+0xc/0x84 (__delay+0x4e/0x50) swapper-0 1dNs3 98us : e1000_swfw_sync_release+0xc/0x55 [e1000] (e1000_read_phy_reg+0x211/0x225 [e1000]) swapper-0 1dNs3 99us+: e1000_put_hw_eeprom_semaphore+0x9/0x35 [e1000] (e1000_swfw_sync_release+0x50/0x55 [e1000]) swapper-0 1dNs3 101us : _spin_unlock_irqrestore+0xe/0x5f (e1000_update_stats+0x641/0x64c [e1000]) swapper-0 1dNs3 102us : _spin_unlock_irqrestore+0x32/0x5f (e1000_update_stats+0x641/0x64c [e1000]) swapper-0 1dNs3 102us : trace_hardirqs_on_caller+0x75/0x89 (_spin_unlock_irqrestore+0x32/0x5f) vim:ft=help ======= Signed-off-by: Steven Rostedt <srostedt@redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>		17 years ago
..
boot	x86: relocs ELF handling - use SELFMAG instead of numeric constant	17 years ago
configs	x86: add optimized inlining	17 years ago
crypto	[CRYPTO] aes-x86-32: Remove unused return code	17 years ago
ia32	signals: x86 TS_RESTORE_SIGMASK	17 years ago
kernel	ftrace: trace irq disabled critical timings	17 years ago
kvm	KVM: LAPIC: ignore pending timers if LVTT is disabled	17 years ago
lguest	x86: replace remaining __FUNCTION__ occurances	17 years ago
lib	ftrace: trace irq disabled critical timings	17 years ago
mach-default	spelling fixes: arch/i386/	18 years ago
mach-es7000	i386: es7000 minor cleanups	18 years ago
mach-generic	x86: coding style fixes to arch/x86/mach-generic/bigsmp.c	17 years ago
mach-rdc321x	x86, rdc321x: remove watchdog file	17 years ago
mach-visws	x86: fix compilation error in VisWS	17 years ago
mach-voyager	x86, voyager: fix ioremap_nocache()	17 years ago
math-emu	x86, fpu: split FPU state from task struct - v5	17 years ago
mm	x86: fix crash on cpu hotplug on pat-incapable machines	17 years ago
oprofile	x86: oprofile: remove NR_CPUS arrays in arch/x86/oprofile/nmi_int.c	17 years ago
pci	PCI: Correct last two HP entries in the bfsort whitelist	17 years ago
power	x86: coding style fixes to arch/x86/power/cpu_32.c	17 years ago
vdso	x86: add notrace annotations to vsyscall.	17 years ago
video	x86: video/fbdev.c: add MODULE_LICENSE	17 years ago
xen	pageflags: use proper page flag functions in Xen	17 years ago
Kconfig	ftrace: add basic support for gcc profiler instrumentation	17 years ago
Kconfig.cpu	x86: CONFIG_X86_ELAN fix	17 years ago
Kconfig.debug	x86: Mark OPTIMIZE_INLINING broken	17 years ago
Makefile	x86: add subarch support (for headers) to x86_64	17 years ago
Makefile_32.cpu	x86: move i386 and x86_64 Makefiles to arch/x86	18 years ago