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Mon, 6 Jul 2026 16:54:48 +0000 (GMT) From: Ilya Leoshkevich To: Richard Henderson , Paolo Bonzini Cc: qemu-devel@nongnu.org, Ilya Leoshkevich Subject: [PATCH v2 2/3] tests/tcg/multiarch: Improve mutator randomness Date: Mon, 6 Jul 2026 18:51:24 +0200 Message-ID: <20260706165445.57418-3-iii@linux.ibm.com> X-Mailer: git-send-email 2.54.0 In-Reply-To: <20260706165445.57418-1-iii@linux.ibm.com> References: <20260706165445.57418-1-iii@linux.ibm.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Authority-Analysis: v=2.4 cv=KsJ9H2WN c=1 sm=1 tr=0 ts=6a4bdddb cx=c_pps a=aDMHemPKRhS1OARIsFnwRA==:117 a=aDMHemPKRhS1OARIsFnwRA==:17 a=RAioF0-LDSMA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe:22 a=VnNF1IyMAAAA:8 a=hE59dl1hCYpwDpkaMNEA:9 X-Proofpoint-Spam-Info: AW1haW4tMjYwNzA2MDE3MCBTYWx0ZWRfX9vh0t3prrICM e+B19m9TbgOvdrxJmFW5TZDsPk1o7IIsz3O6btwBBEn1rODjQTmuE9NCehXUbSgawEXjEQk3cZa jelDJa+/0nC8TJxxmC6ZfoNJMXDSp0k= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNzA2MDE3MCBTYWx0ZWRfX+SaJqKRp4+ub pu3Br6vvDv+QuPMu132Wt4t52esYw0RDdm5wMGQ60Zx/xIrBbV1QVKgpGQH7CuRrJyZ1nStS5yn pXXOrdQldyuDH7sHFwINZ4ImeREtGMt9XFrEeRTvFOrssESoweOYcdSQAOfkWzpplyuNBZg9TZE cNeRaDiscgbeqE77mA3B2q23jhXwFDlLZO6SFFEjf7ARzOC9lYTcmg7hGEOrm/sp+ZFgmvZ9kJ2 tSnlx6l95FRXj8l3YN1xzDlxVHZK8+awkxu6XQ9i/d77f+3ygGhwIXVsDs+RGwWZwMhiqeHD6fE VHqcEBnA36ZwleQk1t+XieocG2KqdUg0GvZzCAwZ6PSJ8HHMq53If0Gl6rNRHR31ZAfHjsNRLvh nwRa5mx0hi2kAyFhpUIMCj4/vitLNizE+qDmKyFDg5EndqdppNdk8kcDakubX0pZRM67u6h5OpW 4ptamP76L6Q6jMRGPNw== X-Proofpoint-ORIG-GUID: wx6Ma9gaKma8is53MmY8eli5daoqev8q X-Proofpoint-GUID: wx6Ma9gaKma8is53MmY8eli5daoqev8q X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.134,FMLib:17.12.100.49 definitions=2026-07-06_02,2026-07-06_02,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 malwarescore=0 spamscore=0 adultscore=0 clxscore=1015 suspectscore=0 lowpriorityscore=0 priorityscore=1501 bulkscore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2606150000 definitions=main-2607060170 Received-SPF: pass client-ip=148.163.156.1; envelope-from=iii@linux.ibm.com; helo=mx0a-001b2d01.pphosted.com X-Spam_score_int: -26 X-Spam_score: -2.7 X-Spam_bar: -- X-Spam_report: (-2.7 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: qemu development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Currently mutators perform the same actions, because the RNG seed is derived from the current time in seconds. Mix in thread ID. Signed-off-by: Ilya Leoshkevich --- tests/tcg/multiarch/vma-pthread.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tests/tcg/multiarch/vma-pthread.c b/tests/tcg/multiarch/vma-pthread.c index 7045da08fc4..0b8ce9751be 100644 --- a/tests/tcg/multiarch/vma-pthread.c +++ b/tests/tcg/multiarch/vma-pthread.c @@ -11,6 +11,7 @@ * pages, which are guaranteed to have the respective protection bit set. * Two mutator threads change the non-fixed protection bits randomly. */ +#define _GNU_SOURCE #include #include #include @@ -121,7 +122,7 @@ static void *thread_mutate(void *arg) unsigned int seed; int prot, ret; - seed = (unsigned int)time(NULL); + seed = (unsigned int)time(NULL) + (unsigned int)gettid(); for (i = 0; i < 10000; i++) { start_idx = rand_r(&seed) & PAGE_IDX_MASK; end_idx = rand_r(&seed) & PAGE_IDX_MASK; -- 2.54.0