46 lines
1.2 KiB
C
46 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020 Wenbo Zhang
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "biopattern.h"
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#include "maps.bpf.h"
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const volatile bool filter_dev = false;
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const volatile __u32 targ_dev = 0;
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__uint(max_entries, 64);
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__type(key, u32);
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__type(value, struct counter);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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} counters SEC(".maps");
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SEC("tracepoint/block/block_rq_complete")
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int handle__block_rq_complete(struct trace_event_raw_block_rq_complete *ctx)
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{
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sector_t sector = ctx->sector;
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struct counter *counterp, zero = {};
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u32 nr_sector = ctx->nr_sector;
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u32 dev = ctx->dev;
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if (filter_dev && targ_dev != dev)
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return 0;
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counterp = bpf_map_lookup_or_try_init(&counters, &dev, &zero);
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if (!counterp)
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return 0;
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if (counterp->last_sector) {
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if (counterp->last_sector == sector)
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__sync_fetch_and_add(&counterp->sequential, 1);
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else
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__sync_fetch_and_add(&counterp->random, 1);
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__sync_fetch_and_add(&counterp->bytes, nr_sector * 512);
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}
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counterp->last_sector = sector + nr_sector;
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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