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172 changes: 172 additions & 0 deletions
172
eBPF_Supermarket/CPU_Subsystem/cpu_watcher/bpf/mutrace.bpf.c
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| Original file line number | Diff line number | Diff line change |
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| // Copyright 2023 The LMP Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // https://github.com/linuxkerneltravel/lmp/blob/develop/LICENSE | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
| // | ||
| // author: [email protected] [email protected] [email protected] | ||
|
|
||
| #include <vmlinux.h> | ||
| #include <bpf/bpf_helpers.h> | ||
| #include <bpf/bpf_core_read.h> | ||
| #include <bpf/bpf_tracing.h> | ||
| #include "cpu_watcher.h" | ||
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| char LICENSE[] SEC("license") = "Dual BSD/GPL"; | ||
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| BPF_HASH(mutex_info_map,u64,struct mutex_info, 1024); | ||
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| struct { | ||
| __uint(type, BPF_MAP_TYPE_RINGBUF); | ||
| __uint(max_entries, 256 * 1024); | ||
| } rb SEC(".maps"); | ||
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|
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| /*----------------------------------------------*/ | ||
| /* 内核态互斥锁 */ | ||
| /*----------------------------------------------*/ | ||
|
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| SEC("kprobe/mutex_lock") | ||
| int BPF_KPROBE(trace_mutex_lock, struct mutex *lock) { | ||
| u64 lock_addr = (u64)lock; // 获取锁地址 | ||
| u64 ts = bpf_ktime_get_ns(); | ||
| struct mutex_info *info = bpf_map_lookup_elem(&mutex_info_map, &lock_addr); | ||
| if (info) { | ||
| info->acquire_time = ts; // 保存锁获取时间 | ||
| } else { | ||
| struct mutex_info new_info = { | ||
| .locked_total = 0, | ||
| .locked_max = 0, | ||
| .contended_total = 0, | ||
| .last_owner = 0, | ||
| .acquire_time = ts, | ||
| .ptr = lock_addr | ||
| }; | ||
| bpf_map_update_elem(&mutex_info_map, &lock_addr, &new_info, BPF_ANY); | ||
| } | ||
| return 0; | ||
| } | ||
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| SEC("kprobe/mutex_trylock") | ||
| int BPF_KPROBE(trace_mutex_trylock, struct mutex *lock) { | ||
| int ret = PT_REGS_RC(ctx); | ||
| if (ret == 0) { // 成功获取锁 | ||
| u64 lock_addr = (u64)lock; // 获取锁地址 | ||
| u64 ts = bpf_ktime_get_ns(); | ||
| struct mutex_info *info = bpf_map_lookup_elem(&mutex_info_map, &lock_addr); | ||
| if (info) { | ||
| info->acquire_time = ts; | ||
| } else { | ||
| struct mutex_info new_info = { | ||
| .locked_total = 0, | ||
| .locked_max = 0, | ||
| .contended_total = 0, | ||
| .last_owner = 0, | ||
| .acquire_time = ts, | ||
| .ptr = lock_addr | ||
| }; | ||
| bpf_map_update_elem(&mutex_info_map, &lock_addr, &new_info, BPF_ANY); | ||
| } | ||
| } | ||
| return 0; | ||
| } | ||
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| SEC("kprobe/__mutex_lock_slowpath") | ||
| int BPF_KPROBE(trace_mutex_lock_slowpath, struct mutex *lock) { | ||
| struct mutex_contention_event *e; | ||
| struct task_struct *owner_task; | ||
| struct task_struct *contender_task; | ||
| pid_t pid = bpf_get_current_pid_tgid(); | ||
| long owner; | ||
| u64 lock_addr = (u64)lock; | ||
| u64 ts = bpf_ktime_get_ns(); | ||
| e = bpf_ringbuf_reserve(&rb, sizeof(*e), 0); | ||
| if (!e) { | ||
| return 0; | ||
| } | ||
| e->contender_pid = pid; | ||
| e->ptr = lock_addr; | ||
| bpf_get_current_comm(&e->contender_name, sizeof(e->contender_name)); | ||
| bpf_probe_read_kernel(&owner, sizeof(owner), &lock->owner); | ||
| owner_task = (struct task_struct *)(owner & ~0x1L); | ||
| contender_task = (struct task_struct *)bpf_get_current_task(); | ||
| bpf_probe_read_kernel(&e->contender_prio, sizeof(e->contender_prio), &contender_task->prio); | ||
| if (owner_task) { | ||
| bpf_probe_read_kernel(&e->owner_pid, sizeof(e->owner_pid), &owner_task->pid); | ||
| bpf_probe_read_kernel_str(&e->owner_name, sizeof(e->owner_name), owner_task->comm); | ||
| bpf_probe_read_kernel(&e->owner_prio, sizeof(e->owner_prio), &owner_task->prio); | ||
| } else { | ||
| e->owner_pid = 0; | ||
| __builtin_memset(e->owner_name, 0, sizeof(e->owner_name)); | ||
| } | ||
| struct mutex_info *info = bpf_map_lookup_elem(&mutex_info_map, &lock_addr); | ||
| if (info) { | ||
| info->contended_total += ts - info->acquire_time; | ||
| } else { | ||
| struct mutex_info new_info = { | ||
| .locked_total = 0, | ||
| .locked_max = 0, | ||
| .contended_total = ts, | ||
| .last_owner = 0, | ||
| .acquire_time = 0, | ||
| .ptr = lock_addr | ||
| }; | ||
| bpf_map_update_elem(&mutex_info_map, &lock_addr, &new_info, BPF_ANY); | ||
| } | ||
| bpf_ringbuf_submit(e, 0); | ||
| return 0; | ||
| } | ||
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| SEC("kprobe/mutex_unlock") | ||
| int BPF_KPROBE(trace_mutex_unlock, struct mutex *lock) { | ||
| u64 lock_addr = (u64)lock; | ||
| u64 ts = bpf_ktime_get_ns(); | ||
| pid_t pid = bpf_get_current_pid_tgid(); | ||
| struct mutex_info *info = bpf_map_lookup_elem(&mutex_info_map, &lock_addr); | ||
| if (info) { | ||
| u64 held_time = ts - info->acquire_time; // 计算锁被持有的时间 | ||
| info->locked_total += held_time; // 更新锁被持有的总时间 | ||
| if (held_time > info->locked_max) { | ||
| info->locked_max = held_time; // 更新锁被持有的最长时间 | ||
| } | ||
| info->last_owner = pid; // 更新最后一次持有该锁的线程ID | ||
| } | ||
| return 0; | ||
| } | ||
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| /*----------------------------------------------*/ | ||
| /* 用户态互斥锁 */ | ||
| /*----------------------------------------------*/ | ||
|
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| // SEC("uprobe") | ||
| // int BPF_KPROBE(pthread_mutex_lock_init, pthread_mutex_t *mutex){ | ||
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| // } | ||
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| // SEC("uprobe") | ||
| // int BPF_KPROBE(pthread_mutex_lock,pthread_mutex_t *mutex){ | ||
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| // } | ||
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| // SEC("uprobe") | ||
| // int BPF_KPROBE(pthread_mutex_try, pthread_mutex_t *mutex){ | ||
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| // } | ||
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| // SEC("uprobe") | ||
| // int BPF_KPROBE(pthread_mutex_unlock, pthread_mutex_t *mutex){ | ||
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| // } | ||
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| // SEC("uprobe") | ||
| // int BPF_KPROBE(pthread_mutex_destroy, pthread_mutex_t *mutex){ | ||
|
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| // } |
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