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Hahn , Rakie Kim , Byungchul Park , Gregory Price , Ying Huang , Alistair Popple , linux-mm@kvack.org, linux-kernel@vger.kernel.org, Neha Gholkar Subject: Re: [PATCH] mm: mempolicy: fix automatic numa balancing for shmem Message-ID: References: <20260629163337.1264881-1-hannes@cmpxchg.org> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20260629163337.1264881-1-hannes@cmpxchg.org> X-ClientProxiedBy: ME3P282CA0027.AUSP282.PROD.OUTLOOK.COM (2603:10c6:220:f0::14) To CH2PR12MB5001.namprd12.prod.outlook.com (2603:10b6:610:61::18) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CH2PR12MB5001:EE_|SJ0PR12MB7068:EE_ X-MS-Office365-Filtering-Correlation-Id: bfb046af-e644-44cd-304e-08ded7010bf9 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|376014|7416014|23010399003|1800799024|366016|18002099003|22082099003|56012099006|11063799006; X-Microsoft-Antispam-Message-Info: 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going through the git history, this doesn't > actually seem intentional: > > Commit fc3147245d19 ("mm: numa: Limit NUMA scanning to migrate-on-fault > VMAs") added a vma_policy_mof() gate to task_numa_work() so VMAs whose > policy lacks MPOL_F_MOF are skipped from NUMA balancing scans. The > motivation was a real usecase: Oracle was pinning shared segments with > mbind(MPOL_BIND) so trapping faults was both expensive and pointless. > > The handling of NULL from vm_ops->get_policy, however, treated "user > explicitly opted out" the same as "user never specified anything." For > VMAs whose shared policy is absent - the common case for shmem - the > scan was disabled too. > > This issue is old. It probably hurts less in conventional NUMA. But it's > very noticable on tiered systems, where entire tmpfs workingsets can get > stuck on lower-bandwidth memory. > > Fix this by having vma_policy_mof() use __get_vma_policy() directly, and > thereby handle the fallback to task policy (-> preferred_node_policy() > has MPOL_F_MOF per default). Every other consumer of vm_ops->get_policy > already handles it this way, the scan-eligibility check was the outlier. > > This preserves Mel's intended fix: don't scan stuff the user explicitly > pinned. But allow default policy vmas to participate in balancing. > > Reported-by: Neha Gholkar > Tested-by: Neha Gholkar > Fixes: fc3147245d19 ("mm: numa: Limit NUMA scanning to migrate-on-fault VMAs") > Signed-off-by: Johannes Weiner > --- > mm/mempolicy.c | 21 ++++++--------------- > 1 file changed, 6 insertions(+), 15 deletions(-) > > diff --git a/mm/mempolicy.c b/mm/mempolicy.c > index 36699fabd3c2..bba65898aee1 100644 > --- a/mm/mempolicy.c > +++ b/mm/mempolicy.c > @@ -2057,24 +2057,15 @@ struct mempolicy *get_vma_policy(struct vm_area_struct *vma, > bool vma_policy_mof(struct vm_area_struct *vma) > { > struct mempolicy *pol; > + pgoff_t ilx; > + bool mof; > > - if (vma->vm_ops && vma->vm_ops->get_policy) { > - bool ret = false; > - pgoff_t ilx; /* ignored here */ > - > - pol = vma->vm_ops->get_policy(vma, vma->vm_start, &ilx); > - if (pol && (pol->flags & MPOL_F_MOF)) > - ret = true; > - mpol_cond_put(pol); > - > - return ret; > - } > - > - pol = vma->vm_policy; > + pol = __get_vma_policy(vma, vma->vm_start, &ilx); > if (!pol) > pol = get_task_policy(current); > - > - return pol->flags & MPOL_F_MOF; > + mof = pol->flags & MPOL_F_MOF; > + mpol_cond_put(pol); > + return mof; > } > > bool apply_policy_zone(struct mempolicy *policy, enum zone_type zone) > -- > The change to use the fallback seems reasonable Acked-by: Balbir Singh