tools/perf/tests/shell/amd-ibs-swfilt.sh

Source file repositories/reference/linux-study-clean/tools/perf/tests/shell/amd-ibs-swfilt.sh

File Facts

System
Linux kernel
Corpus path
tools/perf/tests/shell/amd-ibs-swfilt.sh
Extension
.sh
Size
2464 bytes
Lines
93
Domain
Support Tooling And Documentation
Bucket
tools
Inferred role
Support Tooling And Documentation: tools
Status
atlas-only

Why This File Exists

Repository support layer: documentation, build tooling, samples, user-space helper tools, generated initramfs support, licenses, and validation utilities.

Dependency Surface

Detected Declarations

Annotated Snippet

#!/bin/bash
# AMD IBS software filtering

ParanoidAndNotRoot() {
  [ "$(id -u)" != 0 ] && [ "$(cat /proc/sys/kernel/perf_event_paranoid)" -gt $1 ]
}

echo "check availability of IBS swfilt"

# check if IBS PMU is available
if [ ! -d /sys/bus/event_source/devices/ibs_op ]; then
    echo "[SKIP] IBS PMU does not exist"
    exit 2
fi

# check if IBS PMU has swfilt format
if [ ! -f /sys/bus/event_source/devices/ibs_op/format/swfilt ]; then
    echo "[SKIP] IBS PMU does not have swfilt"
    exit 2
fi

echo "run perf record with modifier and swfilt"
err=0

# setting any modifiers should fail
perf record -B -e ibs_op//u -o /dev/null true 2> /dev/null
if [ $? -eq 0 ]; then
    echo "[FAIL] IBS PMU should not accept exclude_kernel"
    exit 1
fi

# setting it with swfilt should be fine
perf record -B -e ibs_op/swfilt/u -o /dev/null true
if [ $? -ne 0 ]; then
    echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_kernel"
    exit 1
fi

if ! ParanoidAndNotRoot 1
then
    # setting it with swfilt=1 should be fine
    perf record -B -e ibs_op/swfilt=1/k -o /dev/null true
    if [ $? -ne 0 ]; then
        echo "[FAIL] IBS op PMU cannot handle swfilt for exclude_user"
        exit 1
    fi
else
    echo "[SKIP] not root and perf_event_paranoid too high for exclude_user"
    err=2
fi

# check ibs_fetch PMU as well
perf record -B -e ibs_fetch/swfilt/u -o /dev/null true
if [ $? -ne 0 ]; then
    echo "[FAIL] IBS fetch PMU cannot handle swfilt for exclude_kernel"
    exit 1
fi

# check system wide recording
if ! ParanoidAndNotRoot 0
then
    perf record -aB --synth=no -e ibs_op/swfilt/k -o /dev/null true
    if [ $? -ne 0 ]; then
        echo "[FAIL] IBS op PMU cannot handle swfilt in system-wide mode"
        exit 1
    fi
else
    echo "[SKIP] not root and perf_event_paranoid too high for system-wide/exclude_user"
    err=2
fi

Annotation

Implementation Notes