traces/
kernel.rs

1// Copyright 2024 The Fuchsia Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4use crate::watcher::Watcher;
5use anyhow::Result;
6use fuchsia_async::{Interval, MonotonicDuration};
7use fuchsia_trace::{category_enabled, counter};
8use futures::StreamExt;
9use log::debug;
10use stalls::StallProvider;
11use std::ffi::CStr;
12use std::sync::Arc;
13const CATEGORY_MEMORY_KERNEL: &'static CStr = c"memory:kernel";
14
15// Continuously monitors the 'memory:kernel' trace category.
16// Once enabled, it periodically records memory statistics until the category is disabled.
17// This function runs indefinitely
18pub async fn serve_forever(
19    mut trace_watcher: Watcher,
20    kernel_stats: impl fidl_fuchsia_kernel::StatsProxyInterface,
21    stall_provider: Arc<impl StallProvider>,
22) {
23    eprintln!("Start serving traces");
24    debug!("Start serving traces");
25    loop {
26        let delay_in_secs = 1;
27        let mut interval = Interval::new(MonotonicDuration::from_seconds(1));
28        while category_enabled(CATEGORY_MEMORY_KERNEL) {
29            if let Err(err) = publish_one_sample(&kernel_stats, stall_provider.clone()).await {
30                log::warn!("Failed to trace on category {:?} : {:?}", CATEGORY_MEMORY_KERNEL, err);
31            }
32            debug!("Wait for {} second(s)", delay_in_secs);
33            interval.next().await;
34        }
35        debug!("Trace category {:?} not active. Waiting.", CATEGORY_MEMORY_KERNEL);
36        trace_watcher.recv().await;
37        debug!("Trace event detected");
38    }
39}
40
41async fn publish_one_sample(
42    kernel_stats: &impl fidl_fuchsia_kernel::StatsProxyInterface,
43    stall_provider: Arc<impl StallProvider>,
44) -> Result<()> {
45    debug!("Publish trace records for category {:?}", CATEGORY_MEMORY_KERNEL);
46    let mem_stats = kernel_stats.get_memory_stats().await?;
47    // Statistics are split into two records to comply with the 15-argument limit.
48    counter!(CATEGORY_MEMORY_KERNEL, c"kmem_stats_a",0,
49        "total_bytes"=>mem_stats.total_bytes.unwrap_or_default(),
50        "free_bytes"=>mem_stats.free_bytes.unwrap_or_default(),
51        "free_loaned_bytes"=>mem_stats.free_loaned_bytes.unwrap_or_default(),
52        "wired_bytes"=>mem_stats.wired_bytes.unwrap_or_default(),
53        "total_heap_bytes"=>mem_stats.total_heap_bytes.unwrap_or_default(),
54        "free_heap_bytes"=>mem_stats.free_heap_bytes.unwrap_or_default(),
55        "vmo_bytes"=>mem_stats.vmo_bytes.unwrap_or_default(),
56        "mmu_overhead_bytes"=>mem_stats.mmu_overhead_bytes.unwrap_or_default(),
57        "ipc_bytes"=>mem_stats.ipc_bytes.unwrap_or_default(),
58        "cache_bytes"=>mem_stats.cache_bytes.unwrap_or_default(),
59        "slab_bytes"=>mem_stats.slab_bytes.unwrap_or_default(),
60        "zram_bytes"=>mem_stats.zram_bytes.unwrap_or_default(),
61        "other_bytes"=>mem_stats.other_bytes.unwrap_or_default()
62    );
63    counter!(CATEGORY_MEMORY_KERNEL, c"kmem_stats_b", 0,
64        "vmo_reclaim_total_bytes"=>mem_stats.vmo_reclaim_total_bytes.unwrap_or_default(),
65        "vmo_reclaim_newest_bytes"=>mem_stats.vmo_reclaim_newest_bytes.unwrap_or_default(),
66        "vmo_reclaim_oldest_bytes"=>mem_stats.vmo_reclaim_oldest_bytes.unwrap_or_default(),
67        "vmo_reclaim_disabled_bytes"=>mem_stats.vmo_reclaim_disabled_bytes.unwrap_or_default(),
68        "vmo_discardable_locked_bytes"=>mem_stats.vmo_discardable_locked_bytes.unwrap_or_default(),
69        "vmo_discardable_unlocked_bytes"=>mem_stats.vmo_discardable_unlocked_bytes.unwrap_or_default()
70    );
71    let cmp_stats = kernel_stats.get_memory_stats_compression().await?;
72    counter!(CATEGORY_MEMORY_KERNEL, c"kmem_stats_compression", 0,
73        "uncompressed_storage_bytes"=>cmp_stats.uncompressed_storage_bytes.unwrap_or_default(),
74        "compressed_storage_bytes"=>cmp_stats.compressed_storage_bytes.unwrap_or_default(),
75        "compressed_fragmentation_bytes"=>cmp_stats.compressed_fragmentation_bytes.unwrap_or_default(),
76        "compression_time"=>cmp_stats.compression_time.unwrap_or_default(),
77        "decompression_time"=>cmp_stats.decompression_time.unwrap_or_default(),
78        "total_page_compression_attempts"=>cmp_stats.total_page_compression_attempts.unwrap_or_default(),
79        "failed_page_compression_attempts"=>cmp_stats.failed_page_compression_attempts.unwrap_or_default(),
80        "total_page_decompressions"=>cmp_stats.total_page_decompressions.unwrap_or_default(),
81        "compressed_page_evictions"=>cmp_stats.compressed_page_evictions.unwrap_or_default(),
82        "eager_page_compressions"=>cmp_stats.eager_page_compressions.unwrap_or_default(),
83        "memory_pressure_page_compressions"=>cmp_stats.memory_pressure_page_compressions.unwrap_or_default(),
84        "critical_memory_page_compressions"=>cmp_stats.critical_memory_page_compressions.unwrap_or_default()
85    );
86
87    if let Some(pd) = cmp_stats.pages_decompressed_within_log_time {
88        counter!(
89            CATEGORY_MEMORY_KERNEL,
90            c"kmem_stats_compression_time",0,
91            "pages_decompressed_unit_ns"=>cmp_stats.pages_decompressed_unit_ns.unwrap_or_default(),
92            "pages_decompressed_within_log_time[0]"=>pd[0],
93            "pages_decompressed_within_log_time[1]"=>pd[1],
94            "pages_decompressed_within_log_time[2]"=>pd[2],
95            "pages_decompressed_within_log_time[3]"=>pd[3],
96            "pages_decompressed_within_log_time[4]"=>pd[4],
97            "pages_decompressed_within_log_time[5]"=>pd[5],
98            "pages_decompressed_within_log_time[6]"=>pd[6],
99            "pages_decompressed_within_log_time[7]"=>pd[7]
100        );
101    }
102
103    let stall_info = stall_provider.get_stall_info()?;
104    counter!(
105        CATEGORY_MEMORY_KERNEL,
106        c"memory_stall",0,
107        "stall_time_some_ns"=>stall_info.stall_time_some,
108        "stall_time_full_ns"=>stall_info.stall_time_full
109    );
110
111    Ok(())
112}
traces/kernel.rs

traces/
kernel.rs
