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76fd0285b4
DAMON's virtual address spaces monitoring primitive uses 'struct pid *' of the target process as its monitoring target id. The kernel address is exposed as-is to the user space via the DAMON tracepoint, 'damon_aggregated'. Though primarily only privileged users are allowed to access that, it would be better to avoid unnecessarily exposing kernel pointers so. Because the trace result is only required to be able to distinguish each target, we aren't need to use the pointer as-is. This makes the tracepoint to use the index of the target in the context's targets list as its id in the tracepoint, to hide the kernel space address. Link: https://lkml.kernel.org/r/20211229131016.23641-5-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
46 lines
1.1 KiB
C
46 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#undef TRACE_SYSTEM
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#define TRACE_SYSTEM damon
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#if !defined(_TRACE_DAMON_H) || defined(TRACE_HEADER_MULTI_READ)
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#define _TRACE_DAMON_H
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#include <linux/damon.h>
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#include <linux/types.h>
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#include <linux/tracepoint.h>
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TRACE_EVENT(damon_aggregated,
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TP_PROTO(struct damon_target *t, unsigned int target_id,
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struct damon_region *r, unsigned int nr_regions),
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TP_ARGS(t, target_id, r, nr_regions),
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TP_STRUCT__entry(
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__field(unsigned long, target_id)
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__field(unsigned int, nr_regions)
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__field(unsigned long, start)
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__field(unsigned long, end)
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__field(unsigned int, nr_accesses)
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__field(unsigned int, age)
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),
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TP_fast_assign(
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__entry->target_id = target_id;
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__entry->nr_regions = nr_regions;
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__entry->start = r->ar.start;
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__entry->end = r->ar.end;
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__entry->nr_accesses = r->nr_accesses;
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__entry->age = r->age;
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),
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TP_printk("target_id=%lu nr_regions=%u %lu-%lu: %u %u",
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__entry->target_id, __entry->nr_regions,
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__entry->start, __entry->end,
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__entry->nr_accesses, __entry->age)
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);
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#endif /* _TRACE_DAMON_H */
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/* This part must be outside protection */
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#include <trace/define_trace.h>
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