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Fri, 1 Aug 2025 16:42:00 +0000 (GMT) Message-ID: <322f02ee-4de9-4b1c-9727-409eb50c21fe@linux.ibm.com> Date: Fri, 1 Aug 2025 22:12:00 +0530 X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2] powerpc/qspinlock: Add spinlock contention tracepoint To: "Nysal Jan K.A." Cc: Michael Ellerman , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org, Madhavan Srinivasan , Christophe Leroy , Nicholas Piggin References: <20250725081432.1254986-1-nysal@linux.ibm.com> <20250731061856.1858898-1-nysal@linux.ibm.com> From: Shrikanth Hegde Content-Language: en-US In-Reply-To: <20250731061856.1858898-1-nysal@linux.ibm.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: wCuFmtzg-IvhBFynuU-RO3dOMmz8--I1 X-Authority-Analysis: v=2.4 cv=Mbtsu4/f c=1 sm=1 tr=0 ts=688cee60 cx=c_pps a=5BHTudwdYE3Te8bg5FgnPg==:117 a=5BHTudwdYE3Te8bg5FgnPg==:17 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=VnNF1IyMAAAA:8 a=Q9BW1oDvyV82DcSIcF4A:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: SaYTAZEKmauWp9N7F5xDBkM6GAgcK3en X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODAxMDEyNiBTYWx0ZWRfX/Hf8anFraG1b zfy7NTlSWhG67DNHPDxV4JD11ReHLaSWQKIGQh3FpP+nlMg+6RVscqRo7R8fsPL/H3nUO6X09Qe 5NzJ6jBLmD3m4Naon+6qfT+hVP3nfQMvROb8nfQPbVWA7n8pOCD7rvoIFP5mh/8yE152SkY+1Gm Te+zU8JUUhFdKlYf4MBPo7R3VAdRJkMrGDJP+O2leW0X3dV3gOZ7lIVX20CoCK0ch+Rwo9Sstz+ 33I6FR+N1IE+9t3lHcZm3aRgAhzvIAwEMyz/otHeT7GO4SzIeIO0VUlUOQa6C9fgVFLeSzofh9f gkInFmMUw2PqPD5yScbUYew+Y7KgLTQY9B7USMOb1midjUrBpmaQLnUWoSyAY8PN4Gbm8FHgu3D +F4Ld3Y9yY/y4r8DByGCq0Ccml270/jDfaAtuhrZguF+6QTntWVwXMO+GUeIdSBn+nbxo0RL X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-01_05,2025-08-01_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1015 adultscore=0 bulkscore=0 suspectscore=0 priorityscore=1501 spamscore=0 mlxscore=0 impostorscore=0 phishscore=0 mlxlogscore=999 lowpriorityscore=0 malwarescore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2508010126 On 7/31/25 11:48, Nysal Jan K.A. wrote: > Add a lock contention tracepoint in the queued spinlock slowpath. > Also add the __lockfunc annotation so that in_lock_functions() > works as expected. > There is bit of pure code movement. Given that is small, single patch is fine. > Signed-off-by: Nysal Jan K.A. Tried the patch and able to see tracepoints. Reviewed-by: Shrikanth Hegde > --- > arch/powerpc/lib/qspinlock.c | 19 ++++++++++--------- > 1 file changed, 10 insertions(+), 9 deletions(-) > > diff --git a/arch/powerpc/lib/qspinlock.c b/arch/powerpc/lib/qspinlock.c > index bcc7e4dff8c3..95ab4cdf582e 100644 > --- a/arch/powerpc/lib/qspinlock.c > +++ b/arch/powerpc/lib/qspinlock.c > @@ -9,6 +9,7 @@ > #include > #include > #include > +#include > > #define MAX_NODES 4 > > @@ -708,26 +709,26 @@ static __always_inline void queued_spin_lock_mcs_queue(struct qspinlock *lock, b > qnodesp->count--; > } > > -void queued_spin_lock_slowpath(struct qspinlock *lock) > +void __lockfunc queued_spin_lock_slowpath(struct qspinlock *lock) > { > + trace_contention_begin(lock, LCB_F_SPIN); > /* > * This looks funny, but it induces the compiler to inline both > * sides of the branch rather than share code as when the condition > * is passed as the paravirt argument to the functions. > */ > if (IS_ENABLED(CONFIG_PARAVIRT_SPINLOCKS) && is_shared_processor()) { > - if (try_to_steal_lock(lock, true)) { > + if (try_to_steal_lock(lock, true)) > spec_barrier(); > - return; > - } > - queued_spin_lock_mcs_queue(lock, true); > + else > + queued_spin_lock_mcs_queue(lock, true); > } else { > - if (try_to_steal_lock(lock, false)) { > + if (try_to_steal_lock(lock, false)) > spec_barrier(); > - return; > - } > - queued_spin_lock_mcs_queue(lock, false); > + else > + queued_spin_lock_mcs_queue(lock, false); > } > + trace_contention_end(lock, 0); > } > EXPORT_SYMBOL(queued_spin_lock_slowpath); > >