forked from ccfos/huatuo
56 lines
1.4 KiB
C
56 lines
1.4 KiB
C
#include "bpf_common.h"
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#include "vmlinux.h"
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#include "vmlinux_sched.h"
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char __license[] SEC("license") = "Dual MIT/GPL";
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struct mem_cgroup_metric {
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/* cg: direct reclaim count caused by try_charge */
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unsigned long directstall_count;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_HASH);
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__type(key, unsigned long);
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__type(value, struct mem_cgroup_metric);
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__uint(max_entries, 10240);
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} mem_cgroup_map SEC(".maps");
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SEC("tracepoint/vmscan/mm_vmscan_memcg_reclaim_begin")
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int tracepoint_vmscan_mm_vmscan_memcg_reclaim_begin(struct pt_regs *ctx)
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{
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struct cgroup_subsys_state *mm_subsys;
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struct mem_cgroup_metric *valp;
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struct task_struct *task;
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task = (struct task_struct *)bpf_get_current_task();
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if (BPF_CORE_READ(task, flags) & PF_KSWAPD)
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return 0;
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mm_subsys = BPF_CORE_READ(task, cgroups, subsys[memory_cgrp_id]);
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valp = bpf_map_lookup_elem(&mem_cgroup_map, &mm_subsys);
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if (!valp) {
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struct mem_cgroup_metric new_metrics = {
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.directstall_count = 1,
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};
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bpf_map_update_elem(&mem_cgroup_map, &mm_subsys, &new_metrics,
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BPF_ANY);
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return 0;
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}
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__sync_fetch_and_add(&valp->directstall_count, 1);
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return 0;
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}
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SEC("kprobe/mem_cgroup_css_released")
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int kprobe_mem_cgroup_css_released(struct pt_regs *ctx)
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{
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u64 css = PT_REGS_PARM1(ctx);
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bpf_map_delete_elem(&mem_cgroup_map, &css);
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return 0;
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}
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