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Date: Thu, 25 Apr 2019 11:44:59 +0200 From: Thomas Gleixner <tglx@...utronix.de> To: LKML <linux-kernel@...r.kernel.org> Cc: Josh Poimboeuf <jpoimboe@...hat.com>, x86@...nel.org, Andy Lutomirski <luto@...nel.org>, Steven Rostedt <rostedt@...dmis.org>, Alexander Potapenko <glider@...gle.com>, Alexey Dobriyan <adobriyan@...il.com>, Andrew Morton <akpm@...ux-foundation.org>, Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>, linux-mm@...ck.org, David Rientjes <rientjes@...gle.com>, Catalin Marinas <catalin.marinas@....com>, Dmitry Vyukov <dvyukov@...gle.com>, Andrey Ryabinin <aryabinin@...tuozzo.com>, kasan-dev@...glegroups.com, Mike Rapoport <rppt@...ux.vnet.ibm.com>, Akinobu Mita <akinobu.mita@...il.com>, Christoph Hellwig <hch@....de>, iommu@...ts.linux-foundation.org, Robin Murphy <robin.murphy@....com>, Marek Szyprowski <m.szyprowski@...sung.com>, Johannes Thumshirn <jthumshirn@...e.de>, David Sterba <dsterba@...e.com>, Chris Mason <clm@...com>, Josef Bacik <josef@...icpanda.com>, linux-btrfs@...r.kernel.org, dm-devel@...hat.com, Mike Snitzer <snitzer@...hat.com>, Alasdair Kergon <agk@...hat.com>, Daniel Vetter <daniel@...ll.ch>, intel-gfx@...ts.freedesktop.org, Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>, dri-devel@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>, Jani Nikula <jani.nikula@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>, Tom Zanussi <tom.zanussi@...ux.intel.com>, Miroslav Benes <mbenes@...e.cz>, linux-arch@...r.kernel.org Subject: [patch V3 06/29] latency_top: Simplify stack trace handling Replace the indirection through struct stack_trace with an invocation of the storage array based interface. Signed-off-by: Thomas Gleixner <tglx@...utronix.de> --- kernel/latencytop.c | 17 ++--------------- 1 file changed, 2 insertions(+), 15 deletions(-) --- a/kernel/latencytop.c +++ b/kernel/latencytop.c @@ -141,20 +141,6 @@ account_global_scheduler_latency(struct memcpy(&latency_record[i], lat, sizeof(struct latency_record)); } -/* - * Iterator to store a backtrace into a latency record entry - */ -static inline void store_stacktrace(struct task_struct *tsk, - struct latency_record *lat) -{ - struct stack_trace trace; - - memset(&trace, 0, sizeof(trace)); - trace.max_entries = LT_BACKTRACEDEPTH; - trace.entries = &lat->backtrace[0]; - save_stack_trace_tsk(tsk, &trace); -} - /** * __account_scheduler_latency - record an occurred latency * @tsk - the task struct of the task hitting the latency @@ -191,7 +177,8 @@ void __sched lat.count = 1; lat.time = usecs; lat.max = usecs; - store_stacktrace(tsk, &lat); + + stack_trace_save_tsk(tsk, lat.backtrace, LT_BACKTRACEDEPTH, 0); raw_spin_lock_irqsave(&latency_lock, flags);
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