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Officeyutong
2024-02-22 13:14:00 +00:00
parent 403aff5b66
commit 55d5e641bf
47 changed files with 1483 additions and 1918 deletions
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36
10-hardirqs/index.html
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@@ -203,9 +203,9 @@ hardirqs 和 softirqs 是 Linux 内核中两种不同类型的中断处理程序
#include <bpf/bpf_core_read.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include "hardirqs.h"
#include "bits.bpf.h"
#include "maps.bpf.h"
#include "hardirqs.h"
#include "bits.bpf.h"
#include "maps.bpf.h"
#define MAX_ENTRIES 256
@@ -219,21 +219,21 @@ struct {
__type(key, u32);
__type(value, u32);
__uint(max_entries, 1);
} cgroup_map SEC(".maps");
} cgroup_map SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_PERCPU_ARRAY);
__uint(max_entries, 1);
__type(key, u32);
__type(value, u64);
} start SEC(".maps");
} start SEC(".maps");
struct {
__uint(type, BPF_MAP_TYPE_HASH);
__uint(max_entries, MAX_ENTRIES);
__type(key, struct irq_key);
__type(value, struct info);
} infos SEC(".maps");
} infos SEC(".maps");
static struct info zero;
@@ -302,31 +302,31 @@ static int handle_exit(int irq, struct irqaction *action)
return 0;
}
SEC("tp_btf/irq_handler_entry")
SEC("tp_btf/irq_handler_entry")
int BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)
{
return handle_entry(irq, action);
}
SEC("tp_btf/irq_handler_exit")
SEC("tp_btf/irq_handler_exit")
int BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)
{
return handle_exit(irq, action);
}
SEC("raw_tp/irq_handler_entry")
SEC("raw_tp/irq_handler_entry")
int BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)
{
return handle_entry(irq, action);
}
SEC("raw_tp/irq_handler_exit")
SEC("raw_tp/irq_handler_exit")
int BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)
{
return handle_exit(irq, action);
}
char LICENSE[] SEC("license") = "GPL";
char LICENSE[] SEC("license") = "GPL";
</code></pre>
<p>这段代码是一个 eBPF 程序，用于捕获和分析内核中硬件中断处理程序（hardirqs）的执行信息。程序的主要目的是获取中断处理程序的名称、执行次数和执行时间，并以直方图的形式展示执行时间的分布。让我们一步步分析这段代码。</p>
<ol>
@@ -336,9 +336,9 @@ char LICENSE[] SEC(&quot;license&quot;) = &quot;GPL&quot;;
#include &lt;bpf/bpf_core_read.h&gt;
#include &lt;bpf/bpf_helpers.h&gt;
#include &lt;bpf/bpf_tracing.h&gt;
#include &quot;hardirqs.h&quot;
#include &quot;bits.bpf.h&quot;
#include &quot;maps.bpf.h&quot;
#include "hardirqs.h"
#include "bits.bpf.h"
#include "maps.bpf.h"
</code></pre>
<p>该程序包含了 eBPF 开发所需的标准头文件，以及用于定义数据结构和映射的自定义头文件。</p>
</li>
@@ -363,25 +363,25 @@ const volatile bool do_count = false;
<li>
<p>定义 eBPF 程序的入口点：</p>
<pre><code class="language-c">
SEC(&quot;tp_btf/irq_handler_entry&quot;)
SEC("tp_btf/irq_handler_entry")
int BPF_PROG(irq_handler_entry_btf, int irq, struct irqaction *action)
{
return handle_entry(irq, action);
}
SEC(&quot;tp_btf/irq_handler_exit&quot;)
SEC("tp_btf/irq_handler_exit")
int BPF_PROG(irq_handler_exit_btf, int irq, struct irqaction *action)
{
return handle_exit(irq, action);
}
SEC(&quot;raw_tp/irq_handler_entry&quot;)
SEC("raw_tp/irq_handler_entry")
int BPF_PROG(irq_handler_entry, int irq, struct irqaction *action)
{
return handle_entry(irq, action);
}
SEC(&quot;raw_tp/irq_handler_exit&quot;)
SEC("raw_tp/irq_handler_exit")
int BPF_PROG(irq_handler_exit, int irq, struct irqaction *action)
{
return handle_exit(irq, action);