From: Andrii Nakryiko <andrii@kernel.org>
To: linux-fsdevel@vger.kernel.org, brauner@kernel.org,
viro@zeniv.linux.org.uk, akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org, bpf@vger.kernel.org,
gregkh@linuxfoundation.org, linux-mm@kvack.org,
Andrii Nakryiko <andrii@kernel.org>
Subject: [PATCH 0/5] ioctl()-based API to query VMAs from /proc/<pid>/maps
Date: Fri, 3 May 2024 17:30:01 -0700 [thread overview]
Message-ID: <20240504003006.3303334-1-andrii@kernel.org> (raw)
Implement binary ioctl()-based interface to /proc/<pid>/maps file to allow
applications to query VMA information more efficiently than through textual
processing of /proc/<pid>/maps contents. See patch #2 for the context,
justification, and nuances of the API design.
Patch #1 is a refactoring to keep VMA name logic determination in one place.
Patch #2 is the meat of kernel-side API.
Patch #3 just syncs UAPI header (linux/fs.h) into tools/include.
Patch #4 adjusts BPF selftests logic that currently parses /proc/<pid>/maps to
optionally use this new ioctl()-based API, if supported.
Patch #5 implements a simple C tool to demonstrate intended efficient use (for
both textual and binary interfaces) and allows benchmarking them. Patch itself
also has performance numbers of a test based on one of the medium-sized
internal applications taken from production.
This patch set was based on top of next-20240503 tag in linux-next tree.
Not sure what should be the target tree for this, I'd appreciate any guidance,
thank you!
Andrii Nakryiko (5):
fs/procfs: extract logic for getting VMA name constituents
fs/procfs: implement efficient VMA querying API for /proc/<pid>/maps
tools: sync uapi/linux/fs.h header into tools subdir
selftests/bpf: make use of PROCFS_PROCMAP_QUERY ioctl, if available
selftests/bpf: a simple benchmark tool for /proc/<pid>/maps APIs
fs/proc/task_mmu.c | 290 +++++++++++---
include/uapi/linux/fs.h | 32 ++
.../perf/trace/beauty/include/uapi/linux/fs.h | 32 ++
tools/testing/selftests/bpf/.gitignore | 1 +
tools/testing/selftests/bpf/Makefile | 2 +-
tools/testing/selftests/bpf/procfs_query.c | 366 ++++++++++++++++++
tools/testing/selftests/bpf/test_progs.c | 3 +
tools/testing/selftests/bpf/test_progs.h | 2 +
tools/testing/selftests/bpf/trace_helpers.c | 105 ++++-
9 files changed, 763 insertions(+), 70 deletions(-)
create mode 100644 tools/testing/selftests/bpf/procfs_query.c
--
2.43.0
next reply other threads:[~2024-05-04 0:30 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-05-04 0:30 Andrii Nakryiko [this message]
2024-05-04 0:30 ` [PATCH 1/5] fs/procfs: extract logic for getting VMA name constituents Andrii Nakryiko
2024-05-04 0:30 ` [PATCH 2/5] fs/procfs: implement efficient VMA querying API for /proc/<pid>/maps Andrii Nakryiko
2024-05-04 15:28 ` Greg KH
2024-05-04 21:50 ` Andrii Nakryiko
2024-05-06 13:58 ` Arnaldo Carvalho de Melo
2024-05-06 18:05 ` Namhyung Kim
2024-05-06 18:51 ` Andrii Nakryiko
2024-05-06 18:53 ` Arnaldo Carvalho de Melo
2024-05-06 19:16 ` Arnaldo Carvalho de Melo
2024-05-07 21:55 ` Namhyung Kim
2024-05-06 18:41 ` Andrii Nakryiko
2024-05-06 20:35 ` Arnaldo Carvalho de Melo
2024-05-07 16:36 ` Andrii Nakryiko
2024-05-04 23:36 ` kernel test robot
2024-05-07 18:10 ` Liam R. Howlett
2024-05-07 18:52 ` Andrii Nakryiko
2024-05-04 0:30 ` [PATCH 3/5] tools: sync uapi/linux/fs.h header into tools subdir Andrii Nakryiko
2024-05-04 0:30 ` [PATCH 4/5] selftests/bpf: make use of PROCFS_PROCMAP_QUERY ioctl, if available Andrii Nakryiko
2024-05-04 0:30 ` [PATCH 5/5] selftests/bpf: a simple benchmark tool for /proc/<pid>/maps APIs Andrii Nakryiko
2024-05-04 15:29 ` Greg KH
2024-05-04 21:57 ` Andrii Nakryiko
2024-05-05 5:09 ` Ian Rogers
2024-05-06 18:32 ` Andrii Nakryiko
2024-05-06 18:43 ` Ian Rogers
2024-05-07 5:06 ` Andrii Nakryiko
2024-05-07 17:29 ` Andrii Nakryiko
2024-05-07 22:27 ` Namhyung Kim
2024-05-07 22:56 ` Andrii Nakryiko
2024-05-08 0:36 ` Arnaldo Carvalho de Melo
2024-05-04 15:32 ` Greg KH
2024-05-04 22:13 ` Andrii Nakryiko
2024-05-07 15:48 ` Liam R. Howlett
2024-05-07 16:10 ` Matthew Wilcox
2024-05-07 16:18 ` Liam R. Howlett
2024-05-07 16:27 ` Andrii Nakryiko
2024-05-07 18:06 ` Liam R. Howlett
2024-05-07 19:00 ` Andrii Nakryiko
2024-05-08 1:20 ` Liam R. Howlett
2024-05-04 11:24 ` [PATCH 0/5] ioctl()-based API to query VMAs from /proc/<pid>/maps Christian Brauner
2024-05-04 15:33 ` Greg KH
2024-05-04 21:50 ` Andrii Nakryiko
2024-05-04 21:50 ` Andrii Nakryiko
2024-05-05 5:26 ` Ian Rogers
2024-05-06 18:58 ` Andrii Nakryiko
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