linux-kernel - Re: [PATCH] Add gpu memory tracepoints

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Date:   Mon, 10 Feb 2020 17:22:41 -0800
From:   Yiwei Zhang <zzyiwei@...gle.com>
To:     rostedt@...dmis.org, mingo@...hat.com, linux-kernel@...r.kernel.org
Cc:     Prahlad Kilambi <prahladk@...gle.com>,
        android-kernel <android-kernel@...gle.com>
Subject: Re: [PATCH] Add gpu memory tracepoints

On Mon, Feb 10, 2020 at 5:17 PM Yiwei Zhang <zzyiwei@...gle.com> wrote:
>
> On Mon, Feb 10, 2020 at 5:16 PM <zzyiwei@...gle.com> wrote:
> >
> > From: Yiwei Zhang <zzyiwei@...gle.com>
> >
> > This change adds the below gpu memory tracepoint:
> > gpu_mem/gpu_mem_total: track global or process gpu memory total counters
> >
> > Signed-off-by: Yiwei Zhang <zzyiwei@...gle.com>
> > ---
> >  include/trace/events/gpu_mem.h | 64 ++++++++++++++++++++++++++++++++++
> >  kernel/trace/Kconfig           |  3 ++
> >  kernel/trace/Makefile          |  1 +
> >  kernel/trace/trace_gpu_mem.c   | 13 +++++++
> >  4 files changed, 81 insertions(+)
> >  create mode 100644 include/trace/events/gpu_mem.h
> >  create mode 100644 kernel/trace/trace_gpu_mem.c
> >
> > diff --git a/include/trace/events/gpu_mem.h b/include/trace/events/gpu_mem.h
> > new file mode 100644
> > index 000000000000..3b632a2b5100
> > --- /dev/null
> > +++ b/include/trace/events/gpu_mem.h
> > @@ -0,0 +1,64 @@
> > +/* SPDX-License-Identifier: GPL-2.0 */
> > +/*
> > + * GPU memory trace points
> > + *
> > + * Copyright (C) 2020 Google, Inc.
> > + */
> > +
> > +#undef TRACE_SYSTEM
> > +#define TRACE_SYSTEM gpu_mem
> > +
> > +#if !defined(_TRACE_GPU_MEM_H) || defined(TRACE_HEADER_MULTI_READ)
> > +#define _TRACE_GPU_MEM_H
> > +
> > +#include <linux/tracepoint.h>
> > +
> > +/*
> > + * The gpu_memory_total event indicates that there's an update to either the
> > + * global or process total gpu memory counters.
> > + *
> > + * This event should be emitted whenever the kernel device driver allocates,
> > + * frees, imports, unimports memory in the GPU addressable space.
> > + *
> > + * @gpu_id: This is the gpu id.
> > + *
> > + * @pid: Put 0 for global total, while positive pid for process total.
> > + *
> > + * @size: Virtual size of the allocation in bytes.
> > + *
> > + */
> > +TRACE_EVENT(gpu_mem_total,
> > +       TP_PROTO(
> > +               uint32_t gpu_id,
> > +               uint32_t pid,
> > +               uint64_t size
> > +       ),
> > +       TP_ARGS(
> > +               gpu_id,
> > +               pid,
> > +               size
> > +       ),
> > +       TP_STRUCT__entry(
> > +               __field(uint32_t, gpu_id)
> > +               __field(uint32_t, pid)
> > +               __field(uint64_t, size)
> > +       ),
> > +       TP_fast_assign(
> > +               __entry->gpu_id = gpu_id;
> > +               __entry->pid = pid;
> > +               __entry->size = size;
> > +       ),
> > +       TP_printk(
> > +               "gpu_id=%u "
> > +               "pid=%u "
> > +               "size=%llu",
> > +               __entry->gpu_id,
> > +               __entry->pid,
> > +               __entry->size
> > +       )
> > +);
> > +
> > +#endif /* _TRACE_GPU_MEM_H */
> > +
> > +/* This part must be outside protection */
> > +#include <trace/define_trace.h>
> > diff --git a/kernel/trace/Kconfig b/kernel/trace/Kconfig
> > index 91e885194dbc..cb404755b0a6 100644
> > --- a/kernel/trace/Kconfig
> > +++ b/kernel/trace/Kconfig
> > @@ -85,6 +85,9 @@ config EVENT_TRACING
> >  config CONTEXT_SWITCH_TRACER
> >         bool
> >
> > +config TRACE_GPU_MEM
> > +       bool
> > +
> >  config RING_BUFFER_ALLOW_SWAP
> >         bool
> >         help
> > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> > index f9dcd19165fa..267985313dca 100644
> > --- a/kernel/trace/Makefile
> > +++ b/kernel/trace/Makefile
> > @@ -47,6 +47,7 @@ obj-$(CONFIG_PREEMPTIRQ_DELAY_TEST) += preemptirq_delay_test.o
> >  obj-$(CONFIG_SYNTH_EVENT_GEN_TEST) += synth_event_gen_test.o
> >  obj-$(CONFIG_KPROBE_EVENT_GEN_TEST) += kprobe_event_gen_test.o
> >  obj-$(CONFIG_CONTEXT_SWITCH_TRACER) += trace_sched_switch.o
> > +obj-$(CONFIG_TRACE_GPU_MEM) += trace_gpu_mem.o
> >  obj-$(CONFIG_FUNCTION_TRACER) += trace_functions.o
> >  obj-$(CONFIG_PREEMPTIRQ_TRACEPOINTS) += trace_preemptirq.o
> >  obj-$(CONFIG_IRQSOFF_TRACER) += trace_irqsoff.o
> > diff --git a/kernel/trace/trace_gpu_mem.c b/kernel/trace/trace_gpu_mem.c
> > new file mode 100644
> > index 000000000000..01e855897b6d
> > --- /dev/null
> > +++ b/kernel/trace/trace_gpu_mem.c
> > @@ -0,0 +1,13 @@
> > +// SPDX-License-Identifier: GPL-2.0
> > +/*
> > + * GPU memory trace points
> > + *
> > + * Copyright (C) 2020 Google, Inc.
> > + */
> > +
> > +#include <linux/module.h>
> > +
> > +#define CREATE_TRACE_POINTS
> > +#include <trace/events/gpu_mem.h>
> > +
> > +EXPORT_TRACEPOINT_SYMBOL(gpu_mem_total);
> > --
> > 2.25.0.341.g760bfbb309-goog
> >