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Don't iterate the whole /sys/devices just to find drm device

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upstream: fedora
resolves: bz2003832
conflict: none

commit c6021648f1
Author: Kairui Song <kasong@redhat.com>
Date:   Fri Mar 19 18:21:11 2021 +0800

    Don't iterate the whole /sys/devices just to find drm device

    On some large systems, /sys/devices is huge and it's not a wise idea to
    iterate it. `find` may cause tremendous contention on the kernfs_mutex
    when there are already stress on /sys, and it will perform very very
    poorly.

    Simply check if drm class presents should be good enough.

    Signed-off-by: Kairui Song <kasong@redhat.com>
    Acked-by: Pingfan Liu <piliu@redhat.com>

Signed-off-by: Tao Liu <ltao@redhat.com>
This commit is contained in:
Tao Liu 2021-11-09 20:48:26 +08:00
parent b9cefb4161
commit 98e1935293
1 changed files with 1 additions and 1 deletions
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2
dracut-module-setup.sh
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@ -45,7 +45,7 @@ depends() {
_dep="$_dep znet"
fi
if [ -n "$( find /sys/devices -name drm )" ] || [ -d /sys/module/hyperv_fb ]; then
if [ -n "$( ls -A /sys/class/drm 2>/dev/null )" ] || [ -d /sys/module/hyperv_fb ]; then
add_opt_module drm
fi