From: Oleg Nesterov <oleg@redhat.com>
To: "David Hildenbrand (Arm)" <david@kernel.org>
Cc: Darko Tominac <dtominac@cisco.com>,
Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Ingo Molnar <mingo@redhat.com>,
Arnaldo Carvalho de Melo <acme@kernel.org>,
Namhyung Kim <namhyung@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Alexander Shishkin <alexander.shishkin@linux.intel.com>,
Jiri Olsa <jolsa@kernel.org>, Ian Rogers <irogers@google.com>,
Adrian Hunter <adrian.hunter@intel.com>,
James Clark <james.clark@linaro.org>,
Andrew Morton <akpm@linux-foundation.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
Lorenzo Stoakes <ljs@kernel.org>,
Vlastimil Babka <vbabka@kernel.org>, Jann Horn <jannh@google.com>,
xe-linux-external@cisco.com, danielwa@cisco.com,
linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org,
linux-perf-users@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH] mm/madvise: preserve uprobe breakpoints across MADV_DONTNEED
Date: Wed, 29 Apr 2026 17:24:25 +0200 [thread overview]
Message-ID: <afIiqR5CqYRId0N0@redhat.com> (raw)
In-Reply-To: <889e4186-9f75-45d3-bd9a-1c90b218a635@kernel.org>
On 04/29, David Hildenbrand (Arm) wrote:
>
> On 4/29/26 15:15, Darko Tominac wrote:
>
> > uprobe infrastructure does not re-instrument pages on individual page
> > faults (uprobe_mmap() is only called during VMA creation, not on
> > page-in), the breakpoints are silently lost once the discarded pages are
> > re-read from the backing file. The probes stop firing with no error
> > indication, and the only recovery is to unregister and re-register the
> > affected uprobes.
>
> Right. Don't MADV_DONTNEED uprobes, just like you are not supposed to
> MADV_DONTNEED debugger breakpoints/set data etc. :)
Agreed, thanks.
Oleg.
next prev parent reply other threads:[~2026-04-29 15:24 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-04-29 13:15 [PATCH] mm/madvise: preserve uprobe breakpoints across MADV_DONTNEED Darko Tominac
2026-04-29 13:31 ` David Hildenbrand (Arm)
2026-04-29 15:24 ` Oleg Nesterov [this message]
2026-04-29 21:11 ` Daniel Walker (danielwa)
2026-04-30 9:16 ` Oleg Nesterov
2026-04-30 9:54 ` David Hildenbrand (Arm)
2026-04-30 18:46 ` Oleg Nesterov
2026-04-30 19:11 ` Jann Horn
2026-04-30 15:22 ` Jann Horn
2026-04-30 19:25 ` Daniel Walker (danielwa)
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