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SubjectRe: [PATCH v2] Add gpu memory tracepoints
On Wed, 12 Feb 2020 16:32:59 -0800
zzyiwei@google.com wrote:

> +#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
> + ),

This is unique whitespace parsing. Usually, this would be:

TP_PROTO(uint32_t gpu_id, unint32_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",

Breaking up a string is frowned upon.

TP_print("gpu_id=%u pid=$u size=%llu",
__entry->gpu_id,
__entry->pid,
__entry->size)

-- Steve

> + __entry->gpu_id,
> + __entry->pid,
> + __entry->size
> + )
> +);
> +
> +#endif /* _TRACE_GPU_MEM_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>

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