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35138437ef
This patch adds three separate per-process fault counters:
- Inode faults
An inode fault happens when we've memory-mapped a file from disk
and we end up having to load 1 page (4KB) of the file into memory.
- Zero faults
Memory returned by mmap() is lazily zeroed out. Every time we have
to zero out 1 page, we count a zero fault.
- CoW faults
VM objects can be shared by multiple mappings that make their own
unique copy iff they want to modify it. The typical reason here is
memory shared between a parent and child process.
73 lines
2.9 KiB
C++
73 lines
2.9 KiB
C++
#include <AK/JsonArray.h>
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#include <AK/JsonObject.h>
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#include <AK/JsonValue.h>
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#include <LibCore/CFile.h>
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#include <LibCore/CProcessStatisticsReader.h>
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#include <pwd.h>
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#include <stdio.h>
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HashMap<uid_t, String> CProcessStatisticsReader::s_usernames;
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HashMap<pid_t, CProcessStatistics> CProcessStatisticsReader::get_all()
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{
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auto file = CFile::construct("/proc/all");
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if (!file->open(CIODevice::ReadOnly)) {
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fprintf(stderr, "CProcessStatisticsReader: Failed to open /proc/all: %s\n", file->error_string());
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return {};
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}
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HashMap<pid_t, CProcessStatistics> map;
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auto file_contents = file->read_all();
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auto json = JsonValue::from_string({ file_contents.data(), file_contents.size() });
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json.as_array().for_each([&](auto& value) {
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const JsonObject& process_object = value.as_object();
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CProcessStatistics process;
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// kernel data first
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process.pid = process_object.get("pid").to_u32();
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process.times_scheduled = process_object.get("times_scheduled").to_u32();
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process.pgid = process_object.get("pgid").to_u32();
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process.pgp = process_object.get("pgp").to_u32();
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process.sid = process_object.get("sid").to_u32();
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process.uid = process_object.get("uid").to_u32();
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process.gid = process_object.get("gid").to_u32();
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process.state = process_object.get("state").to_string();
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process.ppid = process_object.get("ppid").to_u32();
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process.nfds = process_object.get("nfds").to_u32();
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process.name = process_object.get("name").to_string();
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process.tty = process_object.get("tty").to_string();
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process.amount_virtual = process_object.get("amount_virtual").to_u32();
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process.amount_resident = process_object.get("amount_resident").to_u32();
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process.amount_shared = process_object.get("amount_shared").to_u32();
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process.ticks = process_object.get("ticks").to_u32();
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process.priority = process_object.get("priority").to_string();
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process.syscall_count = process_object.get("syscall_count").to_u32();
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process.inode_faults = process_object.get("inode_faults").to_u32();
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process.zero_faults = process_object.get("zero_faults").to_u32();
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process.cow_faults = process_object.get("cow_faults").to_u32();
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process.icon_id = process_object.get("icon_id").to_int();
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// and synthetic data last
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process.username = username_from_uid(process.uid);
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map.set(process.pid, process);
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});
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return map;
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}
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String CProcessStatisticsReader::username_from_uid(uid_t uid)
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{
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if (s_usernames.is_empty()) {
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setpwent();
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while (auto* passwd = getpwent())
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s_usernames.set(passwd->pw_uid, passwd->pw_name);
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endpwent();
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}
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auto it = s_usernames.find(uid);
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if (it != s_usernames.end())
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return (*it).value;
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return String::number(uid);
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}
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