linux-kernel - Perf doesn't show build-id of the application itself

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Message-ID: <CADa2P2VcBsJU5Z+e6-=frxXFOiBxMtVKJ_4=-k1P3cHh9nY17A@mail.gmail.com>
Date:   Sat, 30 May 2020 20:39:41 +0430
From:   Mahmood Naderan <mahmood.nt@...il.com>
To:     linux-kernel@...r.kernel.org
Subject: Perf doesn't show build-id of the application itself

When I run the following perf command for collecting user data

$ perf record -e cycles:u -j any,u -a -o perf.data.user ./test

The output of build-id checking is

$ perf buildid-list -f -i perf.data.user
dbd41c586ea6789f3b998ed28be6ff37134e917a /lib/modules/4.19.125/build/vmlinux
b5381a457906d279073822a5ceb24c4bfef94ddb /lib/x86_64-linux-gnu/libc-2.23.so
ce17e023542265fc11d9bc8f534bb4f070493d30
/lib/x86_64-linux-gnu/libpthread-2.23.so
5d7b6259552275a3c17bd4c3fd05f5a6bf40caa5 /lib/x86_64-linux-gnu/ld-2.23.so
55a35b6df1526bf3d69586896785bf1df0bb4be6 [vdso]
59081d88e819c2fd3bcd8e58bc0c858c0ee2c3a9 /home/mahmood/bin/perf
8edd43fbf5a6d895172d205a7248a814e3b07bb2 /home/mahmood/kernel-4.19.125/test/test
2c0a469e1700fdd0b2f670737dabafeb9c38f909 /opt/glibc-2.23-install/libc.so


As you can see the /home/mahmood/kernel-4.19.125/test/test which is
the binary has a build-id. That is fine. However, when I run

$ perf record -e cycles:k -j any,k -a -o perf.data.kernel ./test

I don't see the application's build-id in the same output

$ perf buildid-list -f -i perf.data.kernel
dbd41c586ea6789f3b998ed28be6ff37134e917a /lib/modules/4.19.125/build/vmlinux
49b4a1a69bb9aebaca5147b9821e1a3a2ca759f3
/lib/modules/4.19.125/kernel/net/ipv4/netfilter/iptable_filter.ko
bb4e88298fe274b1bec7ba8ab24e6a9670b93d04
/lib/modules/4.19.125/kernel/net/ipv4/netfilter/nf_nat_ipv4.ko
ee37b9e0cc9b7be3ca543ecfeaa6bde28b77df7d
/lib/modules/4.19.125/kernel/net/netfilter/nf_nat.ko
2bc71fd8d0c750aa3427a31639ce75a16a3c288c
/lib/modules/4.19.125/kernel/net/netfilter/nf_conntrack.ko
e5dfa4829fe8f9ed3185b708225a5bab8d6d0afe
/lib/modules/4.19.125/kernel/net/ipv4/netfilter/nf_defrag_ipv4.ko
5d52d35a5b99dd81fed002ba571a7afe32b26cbd
/lib/modules/4.19.125/kernel/net/ipv4/netfilter/ip_tables.ko
d19830cb5c697cb2583d327c28aa3961c945005d
/lib/modules/4.19.125/kernel/drivers/gpu/drm/nouveau/nouveau.ko
b816c95c09032342acd644128cf4d21251b3578a
/lib/modules/4.19.125/kernel/drivers/net/ethernet/intel/igb/igb.ko
da3d32f0230efe8329fae49f9de60ddaeddf48a9
/lib/modules/4.19.125/kernel/drivers/ata/libahci.ko
b5381a457906d279073822a5ceb24c4bfef94ddb /lib/x86_64-linux-gnu/libc-2.23.so
55a35b6df1526bf3d69586896785bf1df0bb4be6 [vdso]

Is there any reason for that? I ask that because my analyzer checks
the build-ids and gives me an error regarding the missing
8edd43fbf5a6d895172d205a7248a814e3b07bb2 which is my application
itself. The analyzer has no problem with the former scenario.


Regards,
Mahmood