Am 17.01.2013 09:55, schrieb [email protected]:
> Port mkdumprd memory trace functions wrote by [email protected]
> For kdump, memory usage tracing is important because there's limited
> memory in kdump 2nd kernel.
>
> Add a rd.memdebug cmdline for this. set rd.memdebug=<X> will set the
> debug level to X which is the debug verbose level.
>
> the format of cmdline is like below:
> <level>[+]:<type>
> <level> is the debug level
> [+] means debug level >= <level>
> <type> is the debug info type, as for this patch I added mem, iomem, slab
> mem is for /proc/meminfo, iomem is for /proc/iomem, slab is for /proc/slabinfo
> Also shortmem is the stripped /proc/meminfo which only includes 3 lines of
> Memfree, Cached and Slab, for example:
> MemFree: 6327176 kB
> Cached: 741916 kB
> Slab: 77284 kB
>
> I added several trace point to the begin of several init hooks
> At cmdline hooks I'm adding trace of "1+:mem 1+:iomem 3+:slab"
> For other hooks I'm adding trace of "1:shortmem 2+:mem 3+:slab"
>
> This means:
> rd.memdebug=1)
> cmdline hook: print mem and iomem
> other hooks: print shortmem
> rd.memdebug=2)
> cmdline hook: print mem and iomem
> other hooks: print mem
> rd.memdebug=3):
> cmdline hook: print mem iomem, and slabinfo
> other hooks: print mem and slabinfo
> *):
> do not print any mem debug info
>
> [v1->v2]: update to use getargnum with <minval> as argument
> print iomem info at cmdline hook as well
> [v2->v3]: harald: use $() instead of ``
> use bash string match instead of grep and pipe.
>
> Signed-off-by: Dave Young <[email protected]>
> ---
> dracut.cmdline.7.asc | 4 +
> modules.d/98systemd/dracut-cmdline.sh | 1
> modules.d/98systemd/dracut-initqueue.sh | 1
> modules.d/98systemd/dracut-pre-pivot.sh | 1
> modules.d/98systemd/dracut-pre-trigger.sh | 1
> modules.d/98systemd/dracut-pre-udev.sh | 1
> modules.d/99base/dracut-lib.sh | 91
> ++++++++++++++++++++++++++++++
> 7 files changed, 100 insertions(+)
>
...
> --- dracut.orig/modules.d/99base/dracut-lib.sh
> +++ dracut/modules.d/99base/dracut-lib.sh
...
> +# parameters: msg [trace_level:trace]...
> +function make_trace_mem()
> +{
local msg
> + msg=$1
> + shift
> + if [ "$DEBUG_MEM_LEVEL" -gt 0 ]; then
> + make_trace show_memstats $DEBUG_MEM_LEVEL "[debug_mem]" "$msg" "$@"
> + fi
> +}
> +
> +# parameters: func log_level prefix msg [trace_level:trace]...
> +function make_trace()
> +{
local func
local log_level
local prefix
.....
> + func=$1
> + shift
> +
> + log_level=$1
> + shift
> +
> + prefix=$1
> + shift
> +
> + msg=$1
> + shift
> +
> + if [ -z "$log_level" ]; then
> + return
> + fi
> +
> + msg=$(echo $msg)
> +
> + msg_printed=0
> + while [ $# -gt 0 ]; do
> + trace=${1%%:*}
> + trace_level=${trace%%+}
> + [ "$trace" != "$trace_level" ] && trace_in_higher_levels="yes"
> + trace=${1##*:}
> +
> + if [ -z "$trace_level" ]; then
> + trace_level=0
> + fi
> +
> + insert_trace=0
> + if [ -n "$trace_in_higher_levels" ]; then
> + if [ "$log_level" -ge "$trace_level" ]; then
> + insert_trace=1
> + fi
> + else
> + if [ "$log_level" -eq "$trace_level" ]; then
> + insert_trace=1
> + fi
> + fi
> +
> + if [ $insert_trace -eq 1 ]; then
> + if [ $msg_printed -eq 0 ]; then
> + echo "$prefix $msg"
> + msg_printed=1
> + fi
> + $func $trace
> + fi
> + shift
> + done
> +}
> +
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