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Editing: slabratetop-bpfcc

#! /usr/bin/python3
# @lint-avoid-python-3-compatibility-imports
#
# slabratetop  Summarize kmem_cache_alloc() calls.
#              For Linux, uses BCC, eBPF.
#
# USAGE: slabratetop [-h] [-C] [-r MAXROWS] [interval] [count]
#
# This uses in-kernel BPF maps to store cache summaries for efficiency.
#
# SEE ALSO: slabtop(1), which shows the cache volumes.
#
# Copyright 2016 Netflix, Inc.
# Licensed under the Apache License, Version 2.0 (the "License")
#
# 15-Oct-2016   Brendan Gregg   Created this.
# 23-Jan-2023   Rong Tao        Introduce kernel internal data structure and
#                               functions to temporarily solve problem for
#                               >=5.16(TODO: fix this workaround)

from __future__ import print_function
from bcc import BPF
from bcc.utils import printb
from time import sleep, strftime
import argparse
from subprocess import call

# arguments
examples = """examples:
    ./slabratetop            # kmem_cache_alloc() top, 1 second refresh
    ./slabratetop -C         # don't clear the screen
    ./slabratetop 5          # 5 second summaries
    ./slabratetop 5 10       # 5 second summaries, 10 times only
"""
parser = argparse.ArgumentParser(
    description="Kernel SLAB/SLUB memory cache allocation rate top",
    formatter_class=argparse.RawDescriptionHelpFormatter,
    epilog=examples)
parser.add_argument("-C", "--noclear", action="store_true",
    help="don't clear the screen")
parser.add_argument("-r", "--maxrows", default=20,
    help="maximum rows to print, default 20")
parser.add_argument("interval", nargs="?", default=1,
    help="output interval, in seconds")
parser.add_argument("count", nargs="?", default=99999999,
    help="number of outputs")
parser.add_argument("--ebpf", action="store_true",
    help=argparse.SUPPRESS)
args = parser.parse_args()
interval = int(args.interval)
countdown = int(args.count)
maxrows = int(args.maxrows)
clear = not int(args.noclear)
debug = 0

# linux stats
loadavg = "/proc/loadavg"

# define BPF program
bpf_text = """
#include <uapi/linux/ptrace.h>
#include <linux/mm.h>
#include <linux/kasan.h>

// memcg_cache_params is a part of kmem_cache, but is not publicly exposed in
// kernel versions 5.4 to 5.8.  Define an empty struct for it here to allow the
// bpf program to compile.  It has been completely removed in kernel version
// 5.9, but it does not hurt to have it here for versions 5.4 to 5.8.
struct memcg_cache_params {};

// introduce kernel interval slab structure and slab_address() function, solved
// 'undefined' error for >=5.16. TODO: we should fix this workaround if BCC
// framework support BTF/CO-RE.
struct slab {
    unsigned long __page_flags;

#if defined(CONFIG_SLAB)

struct kmem_cache *slab_cache;
    union {
        struct {
            struct list_head slab_list;
            void *freelist; /* array of free object indexes */
            void *s_mem;    /* first object */
        };
        struct rcu_head rcu_head;
    };
    unsigned int active;

#elif defined(CONFIG_SLUB)

struct kmem_cache *slab_cache;
    union {
        struct {
            union {
                struct list_head slab_list;
#ifdef CONFIG_SLUB_CPU_PARTIAL
                struct {
                    struct slab *next;
                        int slabs;      /* Nr of slabs left */
                };
#endif
            };
            /* Double-word boundary */
            void *freelist;         /* first free object */
            union {
                unsigned long counters;
                struct {
                    unsigned inuse:16;
                    unsigned objects:15;
                    unsigned frozen:1;
                };
            };
        };
        struct rcu_head rcu_head;
    };
    unsigned int __unused;

#elif defined(CONFIG_SLOB)

struct list_head slab_list;
    void *__unused_1;
    void *freelist;         /* first free block */
    long units;
    unsigned int __unused_2;

#else
#error "Unexpected slab allocator configured"
#endif

atomic_t __page_refcount;
#ifdef CONFIG_MEMCG
    unsigned long memcg_data;
#endif
};

// slab_address() will not be used, and NULL will be returned directly, which
// can avoid adaptation of different kernel versions
static inline void *slab_address(const struct slab *slab)
{
    return NULL;
}

#ifdef CONFIG_64BIT
typedef __uint128_t freelist_full_t;
#else
typedef u64 freelist_full_t;
#endif

typedef union {
	struct {
		void *freelist;
		unsigned long counter;
	};
	freelist_full_t full;
} freelist_aba_t;

#ifdef CONFIG_SLUB
#include <linux/slub_def.h>
#else
#include <linux/slab_def.h>
#endif

#define CACHE_NAME_SIZE 32

// the key for the output summary
struct info_t {
    char name[CACHE_NAME_SIZE];
};

// the value of the output summary
struct val_t {
    u64 count;
    u64 size;
};

BPF_HASH(counts, struct info_t, struct val_t);

int kprobe__kmem_cache_alloc(struct pt_regs *ctx, struct kmem_cache *cachep)
{
    struct info_t info = {};
    const char *name = cachep->name;
    bpf_probe_read_kernel(&info.name, sizeof(info.name), name);

struct val_t *valp, zero = {};
    valp = counts.lookup_or_try_init(&info, &zero);
    if (valp) {
        valp->count++;
        valp->size += cachep->size;
    }

return 0;
}
"""
if debug or args.ebpf:
    print(bpf_text)
    if args.ebpf:
        exit()

# initialize BPF
b = BPF(text=bpf_text)
# check whether hash table batch ops is supported
htab_batch_ops = True if BPF.kernel_struct_has_field(b'bpf_map_ops',
        b'map_lookup_and_delete_batch') == 1 else False

print('Tracing... Output every %d secs. Hit Ctrl-C to end' % interval)

# output
exiting = 0
while 1:
    try:
        sleep(interval)
    except KeyboardInterrupt:
        exiting = 1

# header
    if clear:
        call("clear")
    else:
        print()
    with open(loadavg) as stats:
        print("%-8s loadavg: %s" % (strftime("%H:%M:%S"), stats.read()))
    print("%-32s %6s %10s" % ("CACHE", "ALLOCS", "BYTES"))

# by-TID output
    counts = b.get_table("counts")
    line = 0
    for k, v in reversed(sorted(counts.items_lookup_and_delete_batch()
                                if htab_batch_ops else counts.items(),
                                key=lambda counts: counts[1].size)):
        printb(b"%-32s %6d %10d" % (k.name, v.count, v.size))

line += 1
        if line >= maxrows:
            break
    if not htab_batch_ops:
        counts.clear()

countdown -= 1
    if exiting or countdown == 0:
        print("Detaching...")
        exit()

📁 ＳＫＹＳＨＥＬＬ ＭＡＮＡＧＥＲ-🛒 PHP v7.4.33

Editing: slabratetop-bpfcc

📁 ＳＫＹＳＨＥＬＬＭＡＮＡＧＥＲ-🛒 PHP v7.4.33