41 lines
891 B
C
41 lines
891 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2021 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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__s64 total = 0; /* total cache accesses without counting dirties */
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__s64 misses = 0; /* total of add to lru because of read misses */
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__u64 mbd = 0; /* total of mark_buffer_dirty events */
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SEC("fentry/add_to_page_cache_lru")
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int BPF_PROG(add_to_page_cache_lru)
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{
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__sync_fetch_and_add(&misses, 1);
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return 0;
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}
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SEC("fentry/mark_page_accessed")
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int BPF_PROG(mark_page_accessed)
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{
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__sync_fetch_and_add(&total, 1);
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return 0;
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}
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SEC("fentry/account_page_dirtied")
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int BPF_PROG(account_page_dirtied)
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{
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__sync_fetch_and_add(&misses, -1);
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return 0;
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}
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SEC("fentry/mark_buffer_dirty")
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int BPF_PROG(mark_buffer_dirty)
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{
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__sync_fetch_and_add(&total, -1);
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__sync_fetch_and_add(&mbd, 1);
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return 0;
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}
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char LICENSE[] SEC("license") = "GPL";
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