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scripts: add bpftrace.sh

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This script simplifies execution of bpftrace scripts
for SPDK application analysis. The script should be
invoked as:

scripts/bpftrace.sh `pidof spdk_tgt` script.bt

where 'script.bt' is the name of the bpftrace script
you wish to execute.

The script helps simplify the following:

1) replace __EXE__ markers in the bpftrace script with
   the full path of the spdk executable (required for
   usdt probes);  it uses /proc/<pid>/exe to get the
   full path
2) replace __PID__ markers in the bpftrace script with
   the PID of the spdk process under analysis - this
   allows for doing things like filtering system call
   counts for just the SPDK process
3) invoke bpftrace with the -p <pid> option

Signed-off-by: Jim Harris <james.r.harris@intel.com>
Change-Id: Ib271f26efe4ba326d951a7b30f61b22be755dda7
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/7710
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
Reviewed-by: Konrad Sztyber <konrad.sztyber@intel.com>
Reviewed-by: Ben Walker <benjamin.walker@intel.com>
Reviewed-by: Changpeng Liu <changpeng.liu@intel.com>
This commit is contained in:
Jim Harris 2021-04-30 22:14:51 +00:00 committed by Tomasz Zawadzki
parent 5a1c74bfa4
commit af0bf0f006
1 changed files with 9 additions and 0 deletions
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9
scripts/bpftrace.sh Executable file
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@ -0,0 +1,9 @@
#!/usr/bin/env bash
if [ $# -lt 2 ]; then
echo "usage: $0 <pid> <script>"
exit 1
fi
SCRIPTS_DIR=$(readlink -f $(dirname $0))
BIN_PATH=$(readlink -f /proc/$1/exe)
BPF_SCRIPT=$(sed "s#__EXE__#${BIN_PATH}#g" "${@:2}" | sed "s#__PID__#${1}#g")
bpftrace -p $1 -e "$BPF_SCRIPT"