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Howlett" , Vlastimil Babka , Mike Rapoport , Michal Hocko , Kees Cook , Tejun Heo , =?utf-8?q?Michal_Koutn=C3=BD?= , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Luka Bai X-Mailer: b4 0.15.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1778566802; l=1490; i=lukabai@tencent.com; s=20260501; h=from:subject:message-id; bh=hegqJxsefRUo0IZb6av0loX0beqXtKAilCIuw9AGMOg=; b=PpQmxUSe15FVJGWEVgQ54mSJ/1lP1TFKzTir1B2BYtnj3SMHDa69594F8Hmf2TlrNR0dmx2qS Q4m22WKPwWwD4F4CLCngciseUZUM95VA5i6FGqMEAV4qErxozcS0EKq X-Developer-Key: i=lukabai@tencent.com; a=ed25519; pk=KeaVteSWd00GIAjFyWZnuFsKAKixjga1ZkLMcI66nPM= X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTEyMDA2MCBTYWx0ZWRfX0EYYtqAKu+rD yhcbvq0Iuaphbygoj5MTpyMOFj/S9zSD7ipPt2xh10r7q6GLMgeWnDOIcMhwQwafZcILtGCijJe SbmPA0Gnc+rUuIib7XjHzO1JEq98Obm3T6djFk6ub0sPso4NIRLwYp5OFingNelgizgGP+jvgXl NQvcUDByWZO1dEFVDB1k38KRMLLNd1u/0vYTQilKG9sz45w0VRy1Ut869gv1hWFslAeF9AyAYSK e69KW+mGRkPOAtA641O+e4T52Zl2XC+afS/pYAmNvMitoPMaa704jw6L7J8HjhHQ9caTLdEgtNp Ds/YlM6zgzuj6xvEB1Ig8gEm52uHMjGdswtA6sHjNq7abTSQiYRzmJOAaVtIn4= X-Authority-Info-Out: v=2.4 cv=BryQAIX5 c=1 sm=1 tr=0 ts=6a02c6c7 cx=c_apl:c_pps:t_out a=2G65uMN5HjSv0sBfM2Yj2w==:117 a=2G65uMN5HjSv0sBfM2Yj2w==:17 a=IkcTkHD0fZMA:10 a=NGcC8JguVDcA:10 a=x7bEGLp0ZPQA:10 a=UaoJkeuwEpQA:10 a=VkNPw1HP01LnGYTKEx00:22 a=GvQkQWPkAAAA:8 a=PktQUFpngk8bp4KwMBsA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-GUID: B6dnkmnWxy2EQg2uAF8glNidlGTVlMce X-Proofpoint-ORIG-GUID: B6dnkmnWxy2EQg2uAF8glNidlGTVlMce X-Rspam-User: X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 920D240002 X-Stat-Signature: s5xuzocfgsfo7y6h8ya7gaucpfwgmbyf X-HE-Tag: 1778566857-340721 X-HE-Meta: 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 0dVL588y nz1V071F5DOZWW+Nt8mYeNTvqfM8SrKLjT8DLnImGPbVnw98F6j8yh8safyAa0AusqHRaLZmUva35KofWHO9F93s4TQkb0nTiqSJvPaXxccja84iIG3Cu41WZBjr5F4fuNQTdo+lP2HUHOTr4wEZABEu3fgNivoRLgytujFogORgzqPybv26ppNiTj9RKKrVzWP+IdPJXUQ97YkZ9VnHwOXN5eYmDHhmgDj133ViwjDq+kRt8PlOPs+xgiOrEqsILeRQCn2FwwKVtamvTr6c0AOS9qNf7bIyj+LLCjkXXZwIj3cM= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Luka Bai Cgroup_psi() now includes a condition, and checks against whether the cgroup is the root cgroup to decide whether to use psi_system instead of cgrp->psi. This is mostly because the default hierarchy does not have any psi group attached. So we make psi_system as its psi group, and remove the if condition in cgroup_psi(). Signed-off-by: Luka Bai --- include/linux/psi.h | 2 +- kernel/cgroup/cgroup.c | 3 +++ 2 files changed, 4 insertions(+), 1 deletion(-) diff --git a/include/linux/psi.h b/include/linux/psi.h index e0745873e3f2..8f2db511d051 100644 --- a/include/linux/psi.h +++ b/include/linux/psi.h @@ -34,7 +34,7 @@ __poll_t psi_trigger_poll(void **trigger_ptr, struct file *file, #ifdef CONFIG_CGROUPS static inline struct psi_group *cgroup_psi(struct cgroup *cgrp) { - return cgroup_ino(cgrp) == 1 ? &psi_system : cgrp->psi; + return cgrp->psi; } int psi_cgroup_alloc(struct cgroup *cgrp); diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c index 43adc96c7f1a..357c68662d18 100644 --- a/kernel/cgroup/cgroup.c +++ b/kernel/cgroup/cgroup.c @@ -178,6 +178,9 @@ static DEFINE_PER_CPU(struct cgroup_rstat_base_cpu, root_rstat_base_cpu); /* the default hierarchy */ struct cgroup_root cgrp_dfl_root = { .cgrp.self.rstat_cpu = &root_rstat_cpu, +#ifdef CONFIG_PSI + .cgrp.psi = &psi_system, +#endif .cgrp.rstat_base_cpu = &root_rstat_base_cpu, }; EXPORT_SYMBOL_GPL(cgrp_dfl_root); -- 2.52.0