From nobody Thu Oct 2 02:13:29 2025 Received: from mail-pf1-f175.google.com (mail-pf1-f175.google.com [209.85.210.175]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id C70DF2248B9 for ; Tue, 30 Sep 2025 02:45:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.210.175 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759200326; cv=none; b=JqlN1FWk/OrYmWBzYWixG6ugJNdHD+FX3POsD2dhVgjeWvCN2OjvRXoDfm33F1s7Vh0ZDeSvAJeHhbZzjRzprGjN8uHVek1ZODJ6OGo5Xox6V0mQD3xcOMhs+Lq9qzHpJUgmhhOP+DFZUh1ByS5FVyC/CvTM+vK/4SBrzmiBqqQ= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759200326; c=relaxed/simple; bh=fgMlahiCQseGsOMwUDeQip37398eJhQex5YpJdEa4RY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=F5j+hcNDirHvJVmjgdV/ujqWFTssuGfO7iJDWaPk4OvQk9IWVSSnbvtqkuJBEGVj30Vx/JO+FKCvevuO8O8GbtsCiLRBVO+V6taSaCWL/WSQqu7vrYSy+rTtKbiDets1V06RjUH6uEl4EI50VTSU4YBLqRfMQzZevl7PCjMtoGM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=No9OfCZX; arc=none smtp.client-ip=209.85.210.175 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="No9OfCZX" Received: by mail-pf1-f175.google.com with SMTP id d2e1a72fcca58-782bfd0a977so1881254b3a.3 for ; Mon, 29 Sep 2025 19:45:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1759200324; x=1759805124; darn=vger.kernel.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=Zjvk/jwcgtCF9TRiT6Fv94jzQiYOsdOhmjAblUevyNs=; b=No9OfCZX9owieXBcRX+B6gSVclHzBzJQOdWfoZW1dw/BKdM/Q0KQAv2vYG6qhtGT3Q UiJVzXVzY2mfNRCQoaG6UyHtAI393lh8+dW8+9xeMJ/Vka4UQVCsIE24O4q06u5zhIB/ VIj6CvpUhfWZIkmqbsoAJ+tp5Hz3iF+Q3E722TWAiEEhUZd23IUBRHyTR/FhvioOgjHL YOOIJ6rZmPCltya7R4+Ze4T0vUJ+E/GxezdjyH1OUkysJewfOmNJ6QniD78dJmVe44Jr i2FL0Whnb4tJs/85PK1fO5guI59deBBBqW7dQeheMT4R3CFSlcmfV6df+ah7q5Eua5Uy wshQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759200324; x=1759805124; 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=Zjvk/jwcgtCF9TRiT6Fv94jzQiYOsdOhmjAblUevyNs=; b=hXaek20tLTutgWilEpioBHbnGO3laLD8hmpSzGLGlLAVFUv/O0+ID6YeWo5kCezeRc kQOZnY7gka3947kBDSgfxvI8xIvWvPP3TQGgBnc+01Jb/Ec6xzeCFjVSf2Z1ugTKv5lM B76r+tXNwi9BMDyuJ+o6Q50IT8IjJQJ4K6JcSTiLqZDfFdYVZvrNJV3osd4X7/Mh/32m GxuVHEiMMFiIRzDH0f1YxN9E2IYlOEpZiEY00wMu4mt20tUZl8tXeDcsuRZPmHRi7VUa BcOobFztqp5LOdjFv6HVQav3Txqn8LLAxhKZkuoP2iITGHDQK3Xm3l3XTYUTEVAdb9/z NtGA== X-Forwarded-Encrypted: i=1; AJvYcCVcQJxoxm6Ozsr7GDHv2k3fY4xXECrL3vcDbii7+EOOFnW1q8FFonaULe9O+FCxIt2e3guhEBP3CjoR3ZI=@vger.kernel.org X-Gm-Message-State: AOJu0YzICCEmY/AzavgY2h5lG5MWw+2qTmGX1OSHUaUVMZwLo/Iq3Enp tOuUjOvsf+p0BOBBNMP+EATMjkxXC6zdbgFNepneHIdCjVfmjTvBsn4A X-Gm-Gg: ASbGncsmbLLvQzaP/imEU7bIhzz7oG5lknRP0MQCpclVwWSSI/U4+Dq4iYs80SZsTNz XbJDLl6503Faue5QY093jctun1UJ+P6PUmoT6SX7WFEQJdMSKVYT7KuA03SRv8a9ziVE9qsr4Rh ht54e9GGGCAeieRMJ5DhXcaKKGX7pRc3TR/7+jgf3y4e6wVJjhyW8ejDB+95oeYfVKrSFfzXjI7 ZUZBxtsHNMKcCTG2UM34o5dwB620ywgkLq0tEjaWKrTL4YrBNstGHjStRLG+SnRhZpT1SKB9Wo0 vKeVA32XqmiC7731umzNEOjTomb+bmGaiawGlW86I5Jkz/5ZXpK94v01XpH9Fb82Vslzhd9TcnF M4wSkr3yZN797/cMVXvj122PW/JGN3/C62LymysNlTZqUCX3zk5K7SMCEfWzo1j0OgnnMKYH5Fc Hu X-Google-Smtp-Source: AGHT+IFfp8YXgNuQukwwqsnxDRX708PqLBqQKd9UC8iSffGPe0+X00XIAI7NxbzgZKbYcTueKMe0YQ== X-Received: by 2002:a17:903:3bc5:b0:27d:6777:2833 with SMTP id d9443c01a7336-27ed4a986c5mr179688865ad.47.1759200323854; Mon, 29 Sep 2025 19:45:23 -0700 (PDT) Received: from localhost ([45.142.167.196]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-27ed68821d3sm145446045ad.83.2025.09.29.19.45.21 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Sep 2025 19:45:23 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , Peter Zijlstra , Mike Rapoport , Alexander Potapenko , Randy Dunlap , Marco Elver , Jonathan Corbet , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Valentin Schneider , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , "Liang, Kan" , David Hildenbrand , Lorenzo Stoakes , "Liam R. Howlett" , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Kees Cook , Alice Ryhl , Sami Tolvanen , Miguel Ojeda , Masahiro Yamada , Rong Xu , Naveen N Rao , David Kaplan , Andrii Nakryiko , Jinjie Ruan , Nam Cao , workflows@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, linux-mm@kvack.org, llvm@lists.linux.dev, Andrey Ryabinin , Andrey Konovalov , Dmitry Vyukov , Vincenzo Frascino , kasan-dev@googlegroups.com, "David S. Miller" , Mathieu Desnoyers , linux-trace-kernel@vger.kernel.org Cc: Jinchao Wang Subject: [PATCH v6 12/23] mm/ksw: add entry kprobe and exit fprobe management Date: Tue, 30 Sep 2025 10:43:33 +0800 Message-ID: <20250930024402.1043776-13-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250930024402.1043776-1-wangjinchao600@gmail.com> References: <20250930024402.1043776-1-wangjinchao600@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" Provide ksw_stack_init() and ksw_stack_exit() to manage entry and exit probes for the target function from ksw_get_config(). Signed-off-by: Jinchao Wang --- mm/kstackwatch/kstackwatch.h | 4 ++ mm/kstackwatch/stack.c | 101 +++++++++++++++++++++++++++++++++++ 2 files changed, 105 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 850fc2b18a9c..4045890e5652 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -35,6 +35,10 @@ struct ksw_config { // singleton, only modified in kernel.c const struct ksw_config *ksw_get_config(void); =20 +/* stack management */ +int ksw_stack_init(void); +void ksw_stack_exit(void); + /* watch management */ struct ksw_watchpoint { struct perf_event *__percpu *event; diff --git a/mm/kstackwatch/stack.c b/mm/kstackwatch/stack.c index cec594032515..9f59f41d954c 100644 --- a/mm/kstackwatch/stack.c +++ b/mm/kstackwatch/stack.c @@ -1 +1,102 @@ // 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; + +static int ksw_stack_prepare_watch(struct pt_regs *regs, + const struct ksw_config *config, + ulong *watch_addr, u16 *watch_len) +{ + /* implement logic will be added in following patches */ + *watch_addr =3D 0; + *watch_len =3D 0; + return 0; +} + +static void ksw_stack_entry_handler(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ + struct ksw_ctx *ctx =3D ¤t->ksw_ctx; + ulong watch_addr; + u16 watch_len; + int ret; + + ret =3D ksw_watch_get(&ctx->wp); + if (ret) + return; + + ret =3D ksw_stack_prepare_watch(regs, ksw_get_config(), &watch_addr, + &watch_len); + if (ret) { + ksw_watch_off(ctx->wp); + ctx->wp =3D NULL; + pr_err("failed to prepare watch target: %d\n", ret); + return; + } + + ret =3D ksw_watch_on(ctx->wp, watch_addr, watch_len); + if (ret) { + pr_err("failed to watch on depth:%d addr:0x%lx len:%u %d\n", + ksw_get_config()->depth, 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) +{ + struct ksw_ctx *ctx =3D ¤t->ksw_ctx; + + + if (ctx->wp) { + ksw_watch_off(ctx->wp); + ctx->wp =3D NULL; + ctx->sp =3D 0; + } +} + +int ksw_stack_init(void) +{ + int ret; + char *symbuf =3D NULL; + + memset(&entry_probe, 0, sizeof(entry_probe)); + entry_probe.symbol_name =3D ksw_get_config()->func_name; + entry_probe.offset =3D ksw_get_config()->func_offset; + entry_probe.post_handler =3D ksw_stack_entry_handler; + ret =3D 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 =3D ksw_stack_exit_handler; + symbuf =3D (char *)ksw_get_config()->func_name; + + ret =3D register_fprobe_syms(&exit_probe, (const char **)&symbuf, 1); + if (ret < 0) { + pr_err("failed to register fprobe ret %d\n", ret); + unregister_kprobe(&entry_probe); + return ret; + } + + return 0; +} + +void ksw_stack_exit(void) +{ + unregister_fprobe(&exit_probe); + unregister_kprobe(&entry_probe); +} --=20 2.43.0