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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: =?us-ascii?Q?oxAUtZ6/4m8NTih4ddpinbPqruRAUJ4W0hETpLwEQmuNGSb/4WxFWvxo88KH?= =?us-ascii?Q?izxunwWw6vSnfEULId6YehUkJEcuiAu7yXHbIo4umac8EGvw+XlSfKRZhqgR?= =?us-ascii?Q?mqR6abfx5nc3CK0pCNblNpd+m0mSOS/iimU9qgMsER0MJ7jAxYreD4IK84me?= =?us-ascii?Q?PrxFdczHGACXZ5i3I2VQa/gR1rQGV28+Kl064H+nG9KNb77KS6wjetrpXJog?= =?us-ascii?Q?FWsHi5r8k9Xv5lzegTxKaLgTlibXSLQVwjANf20DpnpKy8kfJSXPfjhX9GXJ?= =?us-ascii?Q?M1yZCJ16ajY+S3V8Z+ZMX76vSTwEZk/HmNgmsAgVu4gPfid7DKPHsMAlOZZl?= =?us-ascii?Q?9TBnnYKsJ0gAvssrQVw7bEQMISMJJr49apyKDiP6bvBY3s5rUTlo75ZPELiJ?= =?us-ascii?Q?vJcONEXlRkR285wE3hgkhlT0YrjAZ5NMaBJJ3UCSOa5ad9AJcpQqhDhsMoLk?= =?us-ascii?Q?gR0T0SjipjJbEy9wEYj2Kfrjmb4uA8bnzfFDbWAYh37r43I9L9Jm6pkB11sL?= =?us-ascii?Q?8BtEEAzq2Pgnn0P3vKkMNbdJHFiy9SXdVER6RRrV2ByxH2HWUrieYHQfxb7h?= =?us-ascii?Q?vTd1KI1IQ9XQvqhq73qAtxMxxKf/e1picgYUPzb/YR1zmD63oZ+vtfrM/w7J?= =?us-ascii?Q?RbOJbSyf3UfPwMZfm9Eo/irpYqa6CoGGemUt8SDFrf+u5n1oEbtvNO/+7Dn2?= =?us-ascii?Q?cxzywSLsV0v1VnPdgtKH0YIAGSiEKOXJ9oDVUlbtr5xlR7RclvsxZaZD3AD4?= =?us-ascii?Q?swyUf2JRjTwQQDCMrWy4/3JCUziVCh2DIlYGoe24ipXeCiTNjHI4btf0dZgU?= =?us-ascii?Q?VggsSbkTh4PZ4HIAuKEwkfXFt0SRgAOkhjPHUktdM2BXwPmNd1D2FQOMB66o?= =?us-ascii?Q?Cc1/R2DljxIrD+aWVTeZ1adkAdEHElWL6SSFU4bQn3w2VKjR3IiD6vrGoKc4?= =?us-ascii?Q?l2amHzLQYNagvgEr/Xpwo8U7L/lmGIOf5hfndXoDm6ebueEdPyOU/7PF/2Pq?= =?us-ascii?Q?SkU8+byCKO21OjLPg1wjHGsg/L4HrP+iMU28T/5ETiu8odomjy2O6VewIRRL?= =?us-ascii?Q?K+yIohmQMqT6FXsMEY/tfQODQP0EJghFTGkm1/KKgSPUfGGK5Gh+JHRyByTX?= =?us-ascii?Q?fu05OWD3IkW3YwJdKnXDQFLlofbsqeUybp1HS0JX3K1b1XEqwxiyi27h2lEK?= =?us-ascii?Q?yeMlF0K/NsNztiiYefX9273Hv8Y/PCL9AAOg9JzPA4aB6oc8uARpRrB+G1Sp?= =?us-ascii?Q?fUUkcgJcTdob77JXW2nZS9Xaq27AWOC343FMdpONwuCAUyz+QTR0WVUluBOH?= =?us-ascii?Q?PzsVly67WwpzvPGk6dCFTjQWX5Cyg1FED2lRC6TpgWyLDGMhqVS80NgmamK2?= =?us-ascii?Q?U3oQfkouVYMkKLqdd4Av+uIfuUl/sjbGJrFmPxXRwWpw4OPxB8F34rHePnQn?= =?us-ascii?Q?4MMT/oQkoQzCMrEEv2ZlgaqOjrFXlpDVhchzbSyEzNXA5zTwvlrPHIcuKOZZ?= =?us-ascii?Q?etimhKnDwaksLeLhTPZkQYx+pRcFcnF+ndfoKoW6R6g82sDyCsk6umPJLrZe?= =?us-ascii?Q?M5Y2YBSiJY5MuLn1BazOjOUkZW8SMvQ4u/n7gfxX?= X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: d5be8368-be4b-4883-ddbd-08dd8da3b859 X-MS-Exchange-CrossTenant-AuthSource: DS7PR12MB9473.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 May 2025 20:14:06.9792 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: NTB6nmCdWtrU+x1Am5h5tl48okc4wiNadachPBhf/TsDuaStl46JcRR2AKlbTSSn X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR12MB7033 On 7 May 2025, at 10:00, Usama Arif wrote: > Allowing override of global THP policy per process allows workloads > that have shown to benefit from hugepages to do so, without regressing > workloads that wouldn't benefit. This will allow such types of workload= s > to be run/stacked on the same machine. > > It also helps in rolling out hugepages in hyperscaler configurations > for workloads that benefit from them, where a single THP policy is like= ly > to be used across the entire fleet, and prctl will help override it. > > Signed-off-by: Usama Arif > --- > include/linux/huge_mm.h | 3 ++- > include/linux/mm_types.h | 7 ++----- > include/uapi/linux/prctl.h | 3 +++ > kernel/sys.c | 16 ++++++++++++++++= > tools/include/uapi/linux/prctl.h | 3 +++ > .../perf/trace/beauty/include/uapi/linux/prctl.h | 3 +++ > 6 files changed, 29 insertions(+), 6 deletions(-) > > diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h > index 2f190c90192d..0587dc4b8e2d 100644 > --- a/include/linux/huge_mm.h > +++ b/include/linux/huge_mm.h > @@ -293,7 +293,8 @@ unsigned long thp_vma_allowable_orders(struct vm_ar= ea_struct *vma, > if (vm_flags & VM_HUGEPAGE) > mask |=3D READ_ONCE(huge_anon_orders_madvise); > if (hugepage_global_always() || > - ((vm_flags & VM_HUGEPAGE) && hugepage_global_enabled())) > + ((vm_flags & VM_HUGEPAGE) && hugepage_global_enabled()) || > + test_bit(MMF_THP_ALWAYS, &vma->vm_mm->flags)) > mask |=3D READ_ONCE(huge_anon_orders_inherit); > > orders &=3D mask; > diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h > index e76bade9ebb1..9bcd72b2b191 100644 > --- a/include/linux/mm_types.h > +++ b/include/linux/mm_types.h > @@ -1704,11 +1704,8 @@ enum { > #define MMF_VM_MERGEABLE 16 /* KSM may merge identical pages */ > #define MMF_VM_HUGEPAGE 17 /* set when mm is available for khugepaged= */ > > -/* > - * This one-shot flag is dropped due to necessity of changing exe once= again > - * on NFS restore > - */ > -//#define MMF_EXE_FILE_CHANGED 18 /* see prctl_set_mm_exe_file() */ > +/* override inherited page sizes to always for the entire process */ > + #define MMF_THP_ALWAYS 18 Could we have something like MMF_THP_POLICY_SET and another field for "always"? Otherwise, how are we going to set MMF_THP_MADVISE if we want it in the future? > > #define MMF_HAS_UPROBES 19 /* has uprobes */ > #define MMF_RECALC_UPROBES 20 /* MMF_HAS_UPROBES can be wrong */ > diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h > index 15c18ef4eb11..22c526681562 100644 > --- a/include/uapi/linux/prctl.h > +++ b/include/uapi/linux/prctl.h > @@ -364,4 +364,7 @@ struct prctl_mm_map { > # define PR_TIMER_CREATE_RESTORE_IDS_ON 1 > # define PR_TIMER_CREATE_RESTORE_IDS_GET 2 > > +#define PR_SET_THP_ALWAYS 78 > +#define PR_GET_THP_ALWAYS 79 > + > #endif /* _LINUX_PRCTL_H */ > diff --git a/kernel/sys.c b/kernel/sys.c > index c434968e9f5d..ee56b059ff1f 100644 > --- a/kernel/sys.c > +++ b/kernel/sys.c > @@ -2658,6 +2658,22 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned lon= g, arg2, unsigned long, arg3, > clear_bit(MMF_DISABLE_THP, &me->mm->flags); > mmap_write_unlock(me->mm); > break; > + case PR_GET_THP_ALWAYS: > + if (arg2 || arg3 || arg4 || arg5) > + return -EINVAL; > + error =3D !!test_bit(MMF_THP_ALWAYS, &me->mm->flags); > + break; > + case PR_SET_THP_ALWAYS: > + if (arg3 || arg4 || arg5) > + return -EINVAL; > + if (mmap_write_lock_killable(me->mm)) > + return -EINTR; > + if (arg2) > + set_bit(MMF_THP_ALWAYS, &me->mm->flags); > + else > + clear_bit(MMF_THP_ALWAYS, &me->mm->flags); > + mmap_write_unlock(me->mm); > + break; prctl can take more than one arguments. Would it be better to add PR_SET_THP_POLICY and PR_GET_THP_POLICY and specify PR_THP_POLICY_ALWAYS in the second argument? So that in the future, if we want to add more THP policies, we do not need to keep piling up PR_{GET,SET}_THP_*? > case PR_MPX_ENABLE_MANAGEMENT: > case PR_MPX_DISABLE_MANAGEMENT: > /* No longer implemented: */ > diff --git a/tools/include/uapi/linux/prctl.h b/tools/include/uapi/linu= x/prctl.h > index 35791791a879..f5f6cff42b3f 100644 > --- a/tools/include/uapi/linux/prctl.h > +++ b/tools/include/uapi/linux/prctl.h > @@ -328,4 +328,7 @@ struct prctl_mm_map { > # define PR_PPC_DEXCR_CTRL_CLEAR_ONEXEC 0x10 /* Clear the aspect on ex= ec */ > # define PR_PPC_DEXCR_CTRL_MASK 0x1f > > +#define PR_GET_THP_ALWAYS 78 > +#define PR_SET_THP_ALWAYS 79 > + > #endif /* _LINUX_PRCTL_H */ > diff --git a/tools/perf/trace/beauty/include/uapi/linux/prctl.h b/tools= /perf/trace/beauty/include/uapi/linux/prctl.h > index 15c18ef4eb11..680996d56faf 100644 > --- a/tools/perf/trace/beauty/include/uapi/linux/prctl.h > +++ b/tools/perf/trace/beauty/include/uapi/linux/prctl.h > @@ -364,4 +364,7 @@ struct prctl_mm_map { > # define PR_TIMER_CREATE_RESTORE_IDS_ON 1 > # define PR_TIMER_CREATE_RESTORE_IDS_GET 2 > > +#define PR_GET_THP_ALWAYS 78 > +#define PR_SET_THP_ALWAYS 79 > + > #endif /* _LINUX_PRCTL_H */ > -- = > 2.47.1 -- Best Regards, Yan, Zi