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Wed, 03 Sep 2025 17:23:00 -0700 (PDT) From: Jinchao Wang To: Andrew Morton , Masami Hiramatsu , "Naveen N . Rao" , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , x86@kernel.org, "H. Peter Anvin" , Peter Zijlstra , 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 , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , linux-perf-users@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Jinchao Wang Subject: [PATCH v2 08/18] mm/ksw: add stack probe support Date: Thu, 4 Sep 2025 08:21:05 +0800 Message-ID: <20250904002126.1514566-9-wangjinchao600@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250904002126.1514566-1-wangjinchao600@gmail.com> References: <20250904002126.1514566-1-wangjinchao600@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: ir45tdu968sa8nb17ysymak11jfk4tuo X-Rspam-User: X-Rspamd-Queue-Id: 455BD12000A X-Rspamd-Server: rspam01 X-HE-Tag: 1756945382-481667 X-HE-Meta: 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 qiOjcdh3 dhWAc06mhx30vS333JraxL+Zs3iznrtXdqSn41Po8HCeXeRsnpc06lvPolGJjPzyNSkhlMSMeaXDnTGWgjx/fm8a/W3kn2F2dzhJK6JWtMlrxgTJ1dPMkb2/c0P7GD0vQfbJ+MnohMyJn//goUHFPZJ0wus61V8v4zyP/l30467mbBfoO0hdkRmWtxSK34ASO4YJSnEamqIoslqpJXUhEGftYfGiFvAv/5yUbyu45xLbGBMVJfZWYplXVTBkcEMpacT2AaqZyiZaBL40qmvhOGbUrZdBdNufMqwIqKO192CHKyqONoyoRDi1iQJUZfgBzkCjEAKpsbxT5zyGJlaKRojlkr9dxANZym+G7Ck6VDG+d0OEV9DKRTPypF4m4yGuBpIupN5DtV0N1iEOmeGhUwPefeGz1pFXIqINKkzZZLLwxIJGMv/BNitT++gP6XuyrHun4kMR+KwA088HzJwFqdHaRUUxlZh/cl/Tm 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: Introduce stack management for KStackWatch using kprobes and fprobes to enable dynamic watch switching: - Entry: prepare target address/length and enable watch - Exit: disable watch Signed-off-by: Jinchao Wang --- mm/kstackwatch/kstackwatch.h | 4 ++ mm/kstackwatch/stack.c | 91 ++++++++++++++++++++++++++++++++++++ 2 files changed, 95 insertions(+) diff --git a/mm/kstackwatch/kstackwatch.h b/mm/kstackwatch/kstackwatch.h index 13ef8c79f855..bc8664af4fa6 100644 --- a/mm/kstackwatch/kstackwatch.h +++ b/mm/kstackwatch/kstackwatch.h @@ -38,6 +38,10 @@ struct ksw_config { extern bool panic_on_catch; +/* stack management */ +int ksw_stack_init(struct ksw_config *config); +void ksw_stack_exit(void); + /* watch management */ int ksw_watch_init(struct ksw_config *config); void ksw_watch_exit(void); diff --git a/mm/kstackwatch/stack.c b/mm/kstackwatch/stack.c index cec594032515..3b72177315cc 100644 --- a/mm/kstackwatch/stack.c +++ b/mm/kstackwatch/stack.c @@ -1 +1,92 @@ // SPDX-License-Identifier: GPL-2.0 + +#include +#include +#include +#include + +#include "kstackwatch.h" + +struct ksw_config *probe_config; + +/* prepare watch_addr and watch_len for watch */ +static int ksw_stack_prepare_watch(struct pt_regs *regs, + struct ksw_config *config, u64 *watch_addr, + u64 *watch_len) +{ + /* TODO: implement logic */ + *watch_addr = 0; + *watch_len = 0; + return 0; +} + +static struct kprobe entry_probe; +static struct fprobe exit_probe_fprobe; + +static void ksw_stack_entry_handler(struct kprobe *p, struct pt_regs *regs, + unsigned long flags) +{ + int ret; + u64 watch_addr; + u64 watch_len; + + ret = ksw_stack_prepare_watch(regs, probe_config, &watch_addr, + &watch_len); + if (ret) { + pr_err("KSW: failed to prepare watch target: %d\n", ret); + return; + } + + ret = ksw_watch_on(watch_addr, watch_len); + if (ret) { + pr_err("KSW: failed to watch on addr:0x%llx len:%llx %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) +{ + ksw_watch_off(); +} + +int ksw_stack_init(struct ksw_config *config) +{ + int ret; + char *symbuf = NULL; + + /* Setup entry probe */ + memset(&entry_probe, 0, sizeof(entry_probe)); + entry_probe.symbol_name = config->function; + entry_probe.offset = config->ip_offset; + entry_probe.post_handler = ksw_stack_entry_handler; + probe_config = config; + ret = register_kprobe(&entry_probe); + if (ret < 0) { + pr_err("KSW: Failed to register kprobe ret %d\n", ret); + return ret; + } + + /* Setup exit probe */ + memset(&exit_probe_fprobe, 0, sizeof(exit_probe_fprobe)); + exit_probe_fprobe.exit_handler = ksw_stack_exit_handler; + symbuf = probe_config->function; + + ret = register_fprobe_syms(&exit_probe_fprobe, (const char **)&symbuf, + 1); + if (ret < 0) { + pr_err("KSW: register_fprobe_syms fail %d\n", ret); + unregister_kprobe(&entry_probe); + return ret; + } + + return 0; +} + +void ksw_stack_exit(void) +{ + unregister_fprobe(&exit_probe_fprobe); + unregister_kprobe(&entry_probe); +} -- 2.43.0