Largest memory mappings

Top RSS mappings by region; spot a leaking heap, mmap or shared lib bloat

pmap -x <pid> | sort -k3 -rn | head
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troubleshooting32 commands
tags
troubleshootingmemorydebug

More troubleshooting commands

  • Kernel slab top consumers
    slabtop -o -s c | head -20

    Sort slab caches by size; dentry/inode bloat explains kernel memory pressure

  • Reclaimable slab memory
    grep -E 'Slab|SReclaimable|SUnreclaim' /proc/meminfo

    Split slab into reclaimable vs unreclaimable; high SUnreclaim = real kernel leak

  • OOM killer in dmesg
    dmesg -T | grep -iE 'killed process|out of memory' | tail

    Find OOM victims with human timestamps; -T avoids unreadable kernel ticks

  • OOM score of process
    cat /proc/<pid>/oom_score /proc/<pid>/oom_score_adj

    Higher oom_score = likelier victim; set oom_score_adj -1000 to immunize a pid

  • cgroup v2 OOM events
    cat /sys/fs/cgroup/<name>/memory.events | grep -E 'oom|max'

    oom_kill/max counters per cgroup; pod hitting memory.max before node-wide OOM

all 32 troubleshooting commands