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a=rsa-sha256; c=relaxed/relaxed; d=mavick.dev; s=MBO0001; t=1786593035; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=p2aTAtzaBo15r45rnzIKt1YFOff3C6zZQXKjs0RwoRE=; b=TZqm343hlculBz0/mBe/XsJsfy+PMuEIL3W+5wlpU8uIMlx0O46lcF619P32GunYbacwFs TeeUeDLDtFPaezUjj5SBiSJimQy8ZIhi2XdulZ1eImEiZrA/GpMiFSOTRVHNWeyC6QCdx6 QbO9bt6qfKrjYqUzUjEfz2RRG4Gzs3aOUrHjmMcAdkGiZ0dDFTxTypaf3BSAXcbM6fzCa6 wR/lbVUE1UkljwahXAQXZGQj/7iSoUEjraQqXJsiEC5i9VsqKAlsmcRscgAvXEqPJmLP+0 4Nwwba/54kF+8tfVB36DF60kN2PoPSJeGQVkoJQkv3oXfbgifeMzXllaBNrv3w== From: Eugene Mavick Date: Thu, 13 Aug 2026 11:49:08 +0800 Subject: [PATCH v5 2/5] refcount: add refcount_final_put tracepoint MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260813-refcount-final-put-trace-v5-2-6e8bf8a38b31@mavick.dev> References: <20260813-refcount-final-put-trace-v5-0-6e8bf8a38b31@mavick.dev> In-Reply-To: <20260813-refcount-final-put-trace-v5-0-6e8bf8a38b31@mavick.dev> To: Will Deacon , Peter Zijlstra , Boqun Feng , Mark Rutland , Gary Guo , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Andrew Morton , Dennis Zhou , Tejun Heo , Christoph Lameter , Dmitry Vyukov , Andrey Konovalov , Alexander Potapenko , Marco Elver , Andrey Ryabinin Cc: linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, linux-mm@kvack.org, kasan-dev@googlegroups.com, Eugene Mavick X-Developer-Signature: v=1; a=openpgp-sha256; l=1864; i=m@mavick.dev; h=from:subject:message-id; bh=d7MkGq8H8zm5dfWimycwfqvz6dfqxiscpXO2Kan5j58=; b=owGbwMvMwCU2V/5U3e1aE3/G02pJDFm1dgdz7yiFsoXdCuBP27WwbKaA23lGK6eAT2uWZLFe2 6Esz7C5o5SFQYyLQVZMkaUmK8E9Y+WsROOjk3pg5rAygQxh4OIUgImk32VkOOZ8vPf03WBZ4UPP ZI918QdanD+88ExExZbmxdV3eO8v2cjI8Fl23sdTzSbrHypN7AvnWfM46qyDoZEu1+MnfrGJ253 28QMA X-Developer-Key: i=m@mavick.dev; a=openpgp; fpr=7C6A604768A99A6133C5928C9D1FCA7EDB7D344F X-Rspamd-Queue-Id: 00199C0007 X-Rspam-User: X-Stat-Signature: ayysk4ehec4kz3617giakdfmwz4kuw4f X-Rspamd-Server: rspam06 X-HE-Tag: 1786593037-243347 X-HE-Meta: U2FsdGVkX18f0OcPnbHdzZsHQMrY9qfOJZB1VOLZLmv7r7cyAILAd2Tl7dQZ3LU+2RQaAUdSzwMvio/bIsEvKg1l/s7slJjsF2jIO7JX6QFagSzCghrUzuZwQIHgkzhPHicX/tlMcS0qP/fKcl0xHtWIVcRZTJ5l37gAfntkXV9zGzB5OWJi/Rqag4CJBbKrAqtRzLyO1Adw3/tAooPbuHuO0D42RarGMaw/hwT45Jr1XhcMbUKkc68RNBI0GtPDvKTNhfcm7Eg2kYPwSP2XyprmGJaLB5d8q8U4USRUWdMOJ3UVRYkuOVxScM5GBzGEUWaz+3ZWiRkPCPYAB/r1ONKSSKk4CCPr3IrozPLUYVY9h76aXQ6iZ1rwnwvu3L5gYxTo9xxHCheaRbdQQqw4wKqR+if6Us1bufzpu+2EAXFZd04WrPkDoUsE158y+or0aqF6UEC2seHxNAMe/qBYthPwQwS0RUkvamnaEFyDyGfNYtbzcrORisya4qmqZSobgKllW7tkEX9PaRBXVbcpkq66Mr+kcgGMVfiuBj4WlRfu9YDgujPbnpMo5yplMjp0TVwFyXb61AeQbu2rQu2IG705hiP2E7oo/KUL7PVI/oZqkZcvFA2LBV1oPkH8ntAmFwCOfDv9fuR5S4dzBpz9DfUce6wZbOXZNTJdA/4wChUUSH4e+2Q9phAckGoIVWAVCE/cn1EZ5s2xSkf3r50k/XopTluVq2H44WZSmLdDpnyNOrNuOBiQDRyZPYrWk8qfv3EW6jdtXyxEXVO+pTzCrgiZJDlVIeOK6CN/prOGEej+zO99UCxPgu3xbVYFmb7MjIMV9V1fX776FiOkv4Ye1j1Pw15b2+ZYL0cTLPeiTMbiKMTfCoud0fcAuPkOrG+q0qvDHGJvJK/tRmffaLObUhd5rbApVnAzEZ9kTFiL3I8EWQ8FBoyZHU6H7yiY0CXGkSSrX98W0SBmUk2Z1dd gC6Dda7/ CmreMeHgDXF0QB1JUHLOXbh76DxHJMLQXkwqwEw5fJkk0UbPn1mpAC/iL55UZAz/8AZDIsTck79om68sm9nLNgvbqEj/LDQR25tcnUfRe8XMyUpmwoaAG5hZy4oZos0ESlHuDRvFJqA6DNT+ntykmRb6bf46fFwqZN8/v7yxCJ5TSJZDYeSL+bDt8VBCrDHrqmES93D+Oqs8aO5UpR7tQDg49vLQ007xUeUfWUjozjNerwgopdT3mKB4Deb8i1Z6BWFPLXdPwOQga0mKAx9DxuQUtLjmjd2go1p1D0CB9x8kmzjH9iNY9n5MetkyBJfxu+iPyQbjzD7P9axtUgrZ7qJadf38Txxnta8XgC8L6e78Jh1w3x85x8TPiyB/eU78JgCBTDsVPMrGKZBiBPUDcBaoRGaQ206SwNC7KYyCxiw9Y7Rc= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add the refcount_final_put tracepoint to __refcount_sub_and_test() and refcount_dec_if_one() refcount_final_put fires when a reference count reaches zero and the object enters its final release path. refcount_final_put records three fields: - caller: function that called the refcounting function(refcount_sub_and_test, percpu_ref_put_many) - ip: return address of trace wrapper macro call - obj: refcount object(struct percpu_ref, refcount_t) Signed-off-by: Eugene Mavick --- include/linux/refcount.h | 2 ++ lib/refcount.c | 6 +++++- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/include/linux/refcount.h b/include/linux/refcount.h index ba7657ced281..23291a31d1be 100644 --- a/include/linux/refcount.h +++ b/include/linux/refcount.h @@ -107,6 +107,7 @@ #include #include #include +#include struct mutex; @@ -393,6 +394,7 @@ bool __refcount_sub_and_test(int i, refcount_t *r, int *oldp) if (old > 0 && old == i) { smp_acquire__after_ctrl_dep(); + do_trace_refcount_final_put(r); return true; } diff --git a/lib/refcount.c b/lib/refcount.c index a207a8f22b3c..8b148b576503 100644 --- a/lib/refcount.c +++ b/lib/refcount.c @@ -7,6 +7,7 @@ #include #include #include +#include #define REFCOUNT_WARN(str) WARN_ONCE(1, "refcount_t: " str ".\n") @@ -56,7 +57,10 @@ bool refcount_dec_if_one(refcount_t *r) { int val = 1; - return atomic_try_cmpxchg_release(&r->refs, &val, 0); + bool ret = atomic_try_cmpxchg_release(&r->refs, &val, 0); + + do_trace_refcount_final_put_cond(ret, r); + return ret; } EXPORT_SYMBOL(refcount_dec_if_one); -- 2.51.2