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wangkefeng.wang@huawei.com, usamaarif642@gmail.com, sunnanyong@huawei.com, vishal.moola@gmail.com, thomas.hellstrom@linux.intel.com, yang@os.amperecomputing.com, kas@kernel.org, aarcange@redhat.com, raquini@redhat.com, anshuman.khandual@arm.com, catalin.marinas@arm.com, tiwai@suse.de, will@kernel.org, dave.hansen@linux.intel.com, jack@suse.cz, cl@gentwo.org, jglisse@google.com, surenb@google.com, zokeefe@google.com, hannes@cmpxchg.org, rientjes@google.com, mhocko@suse.com, rdunlap@infradead.org, hughd@google.com, richard.weiyang@gmail.com, lance.yang@linux.dev, vbabka@suse.cz, rppt@kernel.org, jannh@google.com, pfalcato@suse.de Subject: Re: [PATCH v13 mm-new 05/16] khugepaged: introduce is_mthp_order helper Message-ID: References: <20251201174627.23295-1-npache@redhat.com> <20251201174627.23295-6-npache@redhat.com> Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20251201174627.23295-6-npache@redhat.com> X-ClientProxiedBy: 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List-Unsubscribe: On Mon, Dec 01, 2025 at 10:46:16AM -0700, Nico Pache wrote: > In order to add mTHP support, we will often be checking if a given order > is a mTHP or PMD order. Lets create a simple helper function to keep the > code clean and readable. > > Suggested-by: Lorenzo Stoakes > Signed-off-by: Nico Pache Notwithstanding what Zi said re: using elsewhere (please do :), LGTM so: Reviewed-by: Lorenzo Stoakes > --- > mm/khugepaged.c | 9 +++++++-- > 1 file changed, 7 insertions(+), 2 deletions(-) > > diff --git a/mm/khugepaged.c b/mm/khugepaged.c > index 8599c7fa112e..9c041141b2e3 100644 > --- a/mm/khugepaged.c > +++ b/mm/khugepaged.c > @@ -338,6 +338,11 @@ static bool pte_none_or_zero(pte_t pte) > return pte_present(pte) && is_zero_pfn(pte_pfn(pte)); > } > > +static bool is_mthp_order(unsigned int order) > +{ > + return order != HPAGE_PMD_ORDER; > +} > + > int hugepage_madvise(struct vm_area_struct *vma, > vm_flags_t *vm_flags, int advice) > { > @@ -1071,13 +1076,13 @@ static int alloc_charge_folio(struct folio **foliop, struct mm_struct *mm, > folio = __folio_alloc(gfp, order, node, &cc->alloc_nmask); > if (!folio) { > *foliop = NULL; > - if (order == HPAGE_PMD_ORDER) > + if (!is_mthp_order(order)) > count_vm_event(THP_COLLAPSE_ALLOC_FAILED); > count_mthp_stat(order, MTHP_STAT_COLLAPSE_ALLOC_FAILED); > return SCAN_ALLOC_HUGE_PAGE_FAIL; > } > > - if (order == HPAGE_PMD_ORDER) > + if (!is_mthp_order(order)) > count_vm_event(THP_COLLAPSE_ALLOC); > count_mthp_stat(order, MTHP_STAT_COLLAPSE_ALLOC); > > -- > 2.51.1 >