NAME

       slabratetop - Kernel SLAB/SLUB memory cache allocation rate top.  Uses Linux BPF/bcc.

SYNOPSIS

       slabratetop [-h] [-C] [-r MAXROWS] [interval] [count]

DESCRIPTION

       This  is top for the the rate of kernel SLAB/SLUB memory allocations.  It works by tracing
       kmem_cache_alloc() calls, a commonly used interface for kernel memory allocation (SLAB  or
       SLUB).  It  summarizes the rate and total bytes allocated of these calls per interval: the
       activity. Compare this to slabtop(1), which shows the current static volume of the caches.

       This tool uses kernel dynamic tracing of the kmem_cache_alloc() function.

       Since this uses BPF, only the root user can use this tool.

REQUIREMENTS

       CONFIG_BPF and bcc.

OPTIONS

       -C     Don't clear the screen.

       -r MAXROWS
              Maximum number of rows to print. Default is 20.

       interval
              Interval between updates, seconds.

       count  Number of interval summaries.

EXAMPLES

       Summarize active kernel SLAB/SLUB calls (kmem_cache_alloc()), showing the  top  20  caches
       every second:
              # slabratetop

       Don't clear the screen, and top 8 rows only:
              # slabratetop -Cr 8

       5 second summaries, 10 times only:
              # slabratetop 5 10

FIELDS

       loadavg:
              The contents of /proc/loadavg

       CACHE  Kernel cache name.

       ALLOCS Allocations (number of calls).

       BYTES  Total bytes allocated.

OVERHEAD

       If  kmem_cache_alloc()  is  called  at a high rate (eg, >100k/second) the overhead of this
       tool might begin to be measurable. The rate can be  seen  in  the  ALLOCS  column  of  the
       output.

SOURCE

       This is from bcc.

              https://github.com/iovisor/bcc

       Also  look  in  the bcc distribution for a companion _examples.txt file containing example
       usage, output, and commentary for this tool.

OS

       Linux

STABILITY

       Unstable - in development.

AUTHOR

       Brendan Gregg

SEE ALSO

       slabtop(1)