| // SPDX-License-Identifier: GPL-2.0 |
| // Copyright (c) 2021 Wenbo Zhang |
| #include <vmlinux.h> |
| #include <bpf/bpf_helpers.h> |
| #include <bpf/bpf_tracing.h> |
| |
| __s64 total = 0; /* total cache accesses without counting dirties */ |
| __s64 misses = 0; /* total of add to lru because of read misses */ |
| __u64 mbd = 0; /* total of mark_buffer_dirty events */ |
| |
| SEC("fentry/add_to_page_cache_lru") |
| int BPF_PROG(add_to_page_cache_lru) |
| { |
| __sync_fetch_and_add(&misses, 1); |
| return 0; |
| } |
| |
| SEC("fentry/mark_page_accessed") |
| int BPF_PROG(mark_page_accessed) |
| { |
| __sync_fetch_and_add(&total, 1); |
| return 0; |
| } |
| |
| SEC("fentry/account_page_dirtied") |
| int BPF_PROG(account_page_dirtied) |
| { |
| __sync_fetch_and_add(&misses, -1); |
| return 0; |
| } |
| |
| SEC("fentry/mark_buffer_dirty") |
| int BPF_PROG(mark_buffer_dirty) |
| { |
| __sync_fetch_and_add(&total, -1); |
| __sync_fetch_and_add(&mbd, 1); |
| return 0; |
| } |
| |
| char LICENSE[] SEC("license") = "GPL"; |