* Perf MMAP records differ from /proc/[X]/maps when chroot is used
@ 2022-06-01 18:04 Beau Belgrave
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From: Beau Belgrave @ 2022-06-01 18:04 UTC (permalink / raw)
To: namhyung, jolsa, acme, peterz, mingo; +Cc: linux-trace-devel, linux-kernel
I noticed a related conversation that occurred in the past here:
https://lore.kernel.org/lkml/20220202070828.143303-1-namhyung@kernel.org/
I hit this same issue, however, during debugging I noticed that when
chroot is used the full path including the chroot are in /proc/[X]/maps.
The perf MMAP records only give the relative path within the chroot.
This causes different views of a process when combining mmaps that existed
before perf_event_open() via /proc/[X]/maps and observed mmaps within the
perf_event_open() ring buffer.
I would like to know if this is how mmap records are wanted to be represented
long term via perf? It would be great if these mmap records aligned with how
/proc/[X]/maps are represented so chroot usage becomes (mostly) seamless.
Thanks,
-Beau
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2022-06-01 18:04 Perf MMAP records differ from /proc/[X]/maps when chroot is used Beau Belgrave
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