From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id B4E52CA0FED for ; Wed, 10 Sep 2025 05:32:13 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1C6498E0017; Wed, 10 Sep 2025 01:32:13 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 1768A8E0001; Wed, 10 Sep 2025 01:32:13 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 03E9E8E0017; Wed, 10 Sep 2025 01:32:12 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id E25B88E0001 for ; Wed, 10 Sep 2025 01:32:12 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay03.hostedemail.com (Postfix) with ESMTP id 96FF5BA695 for ; Wed, 10 Sep 2025 05:32:12 +0000 (UTC) X-FDA: 83872219704.27.CA78F16 Received: from mail-pf1-f177.google.com (mail-pf1-f177.google.com [209.85.210.177]) by imf27.hostedemail.com (Postfix) with ESMTP id A506B40004 for ; Wed, 10 Sep 2025 05:32:10 +0000 (UTC) Authentication-Results: imf27.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=eTe0qyUk; spf=pass (imf27.hostedemail.com: domain of wangjinchao600@gmail.com designates 209.85.210.177 as permitted sender) smtp.mailfrom=wangjinchao600@gmail.com; dmarc=pass (policy=none) header.from=gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1757482330; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=jTX/18/Ng4CVcL/DRFC+Yv752wszrnD9hcMkiFmERzI=; b=bbLcmHCK9no7yddfUBZ2OQI6DlcjwKkHRvvJGTknRSfuXa8/nRyl5x5bv0YdUJ1h1Kc17s luBbo/a2qOufF8FaJES05PYwrJp6YEhMjO0xP8cUJV0MBfZALD2ZW2W3PgEYjhWnq1mfPn DxMUb/yt2iKGcG2Xx73sRC/pcHBC7/U= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1757482330; a=rsa-sha256; cv=none; b=EWKRpuC1SzSgnsac7yyjBVnOkoWdaYd3fXThotYoZ/LJd2iLB8QYiFV2zHmn4E9TbcmUld WfFskVcSIe/akcWIrir2Zc74PWpb6stKOlV8j/kA0SWo9z6yWRbiLa0bLWZzEhFHPf4Isp CDQz7UAP6d4tyIt4QT665wvqfQanAi0= ARC-Authentication-Results: i=1; imf27.hostedemail.com; dkim=pass header.d=gmail.com header.s=20230601 header.b=eTe0qyUk; spf=pass (imf27.hostedemail.com: domain of wangjinchao600@gmail.com designates 209.85.210.177 as permitted sender) smtp.mailfrom=wangjinchao600@gmail.com; dmarc=pass (policy=none) header.from=gmail.com Received: by mail-pf1-f177.google.com with SMTP id d2e1a72fcca58-7724cacc32bso5017200b3a.0 for ; Tue, 09 Sep 2025 22:32:10 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1757482329; x=1758087129; darn=kvack.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=jTX/18/Ng4CVcL/DRFC+Yv752wszrnD9hcMkiFmERzI=; b=eTe0qyUkvS9xTDAYdcbG+zspcSiJfGygp6MLfrT55+0UYbf4s/DKiEpxnyYca02Hoe 2ZaZ2zq4zLHP04z/pY5K2Hwt5Mm4Vz3/wiZJBeBTGN4Mj8MMyMdWIftV/fLImNYHiKQH c9Hy50xjLhPnnTiU23iXIkGq4TxyKs/LPFVH/rzYDCFXldO8ABA5u4UVv40rpbAB+z2H ff6rX6PjqEQuYfTQ3g62EvHg4bhw03Q7pjl+Wc5KI95tdBuOtMkaLnWn814q+VgtGQei OVgTOntQZn+agc9uRelmVXUOWQkgVB4OUzqmAMNsrdE7MGXewh6pSHP2ylyhv/3waMuv zOFw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1757482329; x=1758087129; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=jTX/18/Ng4CVcL/DRFC+Yv752wszrnD9hcMkiFmERzI=; b=Z3+wQIqFO9NeVCGRGSScJvvT0ezpXnNAaKBIa3prYDd5X3A1M8WKK70dvEpV7I0tya 2EVoLy3I+tUDDVUbL9hW00In7k5QClLMg+13wGQn1sEecQcj+xhO23SeJ/ZpgR3puXiW gycmO1yEGR6s2Wv1PFWod7Sib6ejaFlkLbw8zXrI8q5Xw4Vx5OIaEiJiH9b9MjrUDLkM 82WOPmjaOS/UN2l6aTutkPXi8UM8TiS27tywu1pXTkRri4XtwM+WoGJd/6m8vQfl6Zaf WX0yUbFptI/x6WCc8lgMcL7QC+LyM3jiaG1dECxeaXBJBjG9EJ8Fi+9XhuKITfexjSkE UQyA== X-Forwarded-Encrypted: i=1; AJvYcCVPRtWYqKgNkb89QF5bcD7WHlBkbfJcLPshEMqw4e2rQmFghZhp74EM1426H1J3qxW8V/ilm044dg==@kvack.org X-Gm-Message-State: AOJu0YzCpFxzUZ14Dn4Z1VpA1vPsM4zVabGJd1H7wkjU/Xny6S1YUUrc fPXOmcClfJ3mCmJ60uEzbmsSnZRz47+SRQIqmNQDo5yOjO6R23jpZWAd X-Gm-Gg: ASbGncsKde8K+ads3VZF+UTLyUVfN3jSmni/yTerIeYM0x/1l55YrXVBVOTMFhTUMmy lnVuyH94MWHuM59toJ5C0aP9a/g9F02Cbo+tGexvpQLhi9Q7rswpWu767waFYsgn3hxklhPsDV9 BIe+oC5YDUh42NryOroksnQQr1X8l7W5jRYCeTEiHSJoGi03EoZQc1PQOu/anuZpSsRk5zgQv4A yk9Ll+Jz8ehINOvXP8zkGr2glBTZU334cJX92vCBtX72LAQG7T05tcyN6cjGXe5WNu+gTCx35xL kHL2ar14tabYW2V/1QrwUrNxpcL4DWd6cryklSP9htKb8K7vKJz2H8gDM7pp065xky9LptRaZmp ws95yX/w3Y1evl6nPM2I4L3IOWboF2V4W7h+H1W8zDCZFl8wPHCht8xbNOxHnRIv/lLrSFMs= X-Google-Smtp-Source: AGHT+IF9kJrtBDYiB4hfn4HCCgf0UorUfbL019zuPVBNsodMy1NJmmuOm2Dva3GcVIGrDCyocRIbhw== X-Received: by 2002:a05:6a00:13a0:b0:770:579a:bb84 with SMTP id d2e1a72fcca58-7742dca7eb8mr15301351b3a.5.1757482329364; Tue, 09 Sep 2025 22:32:09 -0700 (PDT) Received: from localhost.localdomain ([45.8.220.62]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-7746628ffbesm3870342b3a.66.2025.09.09.22.31.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Sep 2025 22:32:08 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , "Naveen N . Rao" , Andrey Ryabinin , Alexander Potapenko , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Steven Rostedt , Mathieu Desnoyers , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , Thomas Gleixner , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jinchao Wang Subject: [PATCH v3 09/19] mm/ksw: add probe management helpers Date: Wed, 10 Sep 2025 13:31:07 +0800 Message-ID: <20250910053147.1152253-1-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250910052335.1151048-1-wangjinchao600@gmail.com> References: <20250910052335.1151048-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: A506B40004 X-Stat-Signature: ud93tzknwenc1wsczm3h3tdge1dh5a6p X-Rspam-User: X-HE-Tag: 1757482330-534530 X-HE-Meta: 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 M9oWWtHp 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Provide ksw_stack_init() and ksw_stack_exit() to manage entry and exit probes for the target function from ksw_get_config(). Use atomic PID tracking to ensure singleton watch. Signed-off-by: Jinchao Wang --- mm/kstackwatch/kstackwatch.h | 4 ++ mm/kstackwatch/stack.c | 99 ++++++++++++++++++++++++++++++++++++ 2 files changed, 103 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 2fa377843f17..79ca40e69268 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -38,6 +38,10 @@ struct ksw_config { // singleton, only modified in kernel.c const struct ksw_config *ksw_get_config(void); +/* stack management */ +int ksw_stack_init(void); +void ksw_stack_exit(void); + /* watch management */ int ksw_watch_init(void); void ksw_watch_exit(void); diff --git a/mm/kstackwatch/stack.c b/mm/kstackwatch/stack.c index cec594032515..72409156458f 100644 --- a/mm/kstackwatch/stack.c +++ b/mm/kstackwatch/stack.c @@ -1 +1,100 @@ // SPDX-License-Identifier: GPL-2.0 +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt + +#include +#include +#include +#include +#include + +#include "kstackwatch.h" + +static struct kprobe entry_probe; +static struct fprobe exit_probe; +#define INVALID_PID -1 +static atomic_t ksw_stack_pid = ATOMIC_INIT(INVALID_PID); + +static int ksw_stack_prepare_watch(struct pt_regs *regs, + const struct ksw_config *config, + u64 *watch_addr, u64 *watch_len) +{ + /* implement logic will be added in following patches */ + *watch_addr = 0; + *watch_len = 0; + return 0; +} + +static void ksw_stack_entry_handler(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ + u64 watch_addr; + u64 watch_len; + int ret; + + if (atomic_cmpxchg(&ksw_stack_pid, INVALID_PID, current->pid) != + INVALID_PID) + return; + + ret = ksw_stack_prepare_watch(regs, ksw_get_config(), &watch_addr, + &watch_len); + if (ret) { + atomic_set(&ksw_stack_pid, INVALID_PID); + pr_err("failed to prepare watch target: %d\n", ret); + return; + } + + ret = ksw_watch_on(watch_addr, watch_len); + if (ret) { + atomic_set(&ksw_stack_pid, INVALID_PID); + pr_err("failed to watch on addr:0x%llx len:%llu %d\n", + watch_addr, watch_len, ret); + return; + } +} + +static void ksw_stack_exit_handler(struct fprobe *fp, unsigned long ip, + unsigned long ret_ip, + struct ftrace_regs *regs, void *data) +{ + if (atomic_read(&ksw_stack_pid) != current->pid) + return; + + ksw_watch_off(); + + atomic_set(&ksw_stack_pid, INVALID_PID); +} + +int ksw_stack_init(void) +{ + int ret; + char *symbuf = NULL; + + memset(&entry_probe, 0, sizeof(entry_probe)); + entry_probe.symbol_name = ksw_get_config()->function; + entry_probe.offset = ksw_get_config()->ip_offset; + entry_probe.post_handler = ksw_stack_entry_handler; + ret = register_kprobe(&entry_probe); + if (ret) { + pr_err("Failed to register kprobe ret %d\n", ret); + return ret; + } + + memset(&exit_probe, 0, sizeof(exit_probe)); + exit_probe.exit_handler = ksw_stack_exit_handler; + symbuf = (char *)ksw_get_config()->function; + + ret = register_fprobe_syms(&exit_probe, (const char **)&symbuf, 1); + if (ret < 0) { + pr_err("register_fprobe_syms fail %d\n", ret); + unregister_kprobe(&entry_probe); + return ret; + } + + return 0; +} + +void ksw_stack_exit(void) +{ + unregister_fprobe(&exit_probe); + unregister_kprobe(&entry_probe); +} -- 2.43.0