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Message-ID: <9617de11-c98a-4610-9c17-11fb981ef3dc@linux.alibaba.com>
Date: Wed, 23 Apr 2025 14:49:00 +0800
From: Baolin Wang <baolin.wang@...ux.alibaba.com>
To: Nico Pache <npache@...hat.com>, linux-mm@...ck.org,
linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-trace-kernel@...r.kernel.org
Cc: akpm@...ux-foundation.org, corbet@....net, rostedt@...dmis.org,
mhiramat@...nel.org, mathieu.desnoyers@...icios.com, david@...hat.com,
baohua@...nel.org, ryan.roberts@....com, willy@...radead.org,
peterx@...hat.com, ziy@...dia.com, wangkefeng.wang@...wei.com,
usamaarif642@...il.com, sunnanyong@...wei.com, vishal.moola@...il.com,
thomas.hellstrom@...ux.intel.com, yang@...amperecomputing.com,
kirill.shutemov@...ux.intel.com, aarcange@...hat.com, raquini@...hat.com,
dev.jain@....com, anshuman.khandual@....com, catalin.marinas@....com,
tiwai@...e.de, will@...nel.org, dave.hansen@...ux.intel.com, jack@...e.cz,
cl@...two.org, jglisse@...gle.com, surenb@...gle.com, zokeefe@...gle.com,
hannes@...xchg.org, rientjes@...gle.com, mhocko@...e.com,
rdunlap@...radead.org
Subject: Re: [PATCH v4 02/12] khugepaged: rename hpage_collapse_* to
khugepaged_*
On 2025/4/17 08:02, Nico Pache wrote:
> functions in khugepaged.c use a mix of hpage_collapse and khugepaged
> as the function prefix.
>
> rename all of them to khugepaged to keep things consistent and slightly
> shorten the function names.
Yes, make sense to me.
> Signed-off-by: Nico Pache <npache@...hat.com>
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>
Nit: this renaming cleanup should be put in patch 1.
> ---
> mm/khugepaged.c | 50 ++++++++++++++++++++++++-------------------------
> 1 file changed, 25 insertions(+), 25 deletions(-)
>
> diff --git a/mm/khugepaged.c b/mm/khugepaged.c
> index cecadc4239e7..b6281c04f1e5 100644
> --- a/mm/khugepaged.c
> +++ b/mm/khugepaged.c
> @@ -402,14 +402,14 @@ void __init khugepaged_destroy(void)
> kmem_cache_destroy(mm_slot_cache);
> }
>
> -static inline int hpage_collapse_test_exit(struct mm_struct *mm)
> +static inline int khugepaged_test_exit(struct mm_struct *mm)
> {
> return atomic_read(&mm->mm_users) == 0;
> }
>
> -static inline int hpage_collapse_test_exit_or_disable(struct mm_struct *mm)
> +static inline int khugepaged_test_exit_or_disable(struct mm_struct *mm)
> {
> - return hpage_collapse_test_exit(mm) ||
> + return khugepaged_test_exit(mm) ||
> test_bit(MMF_DISABLE_THP, &mm->flags);
> }
>
> @@ -444,7 +444,7 @@ void __khugepaged_enter(struct mm_struct *mm)
> int wakeup;
>
> /* __khugepaged_exit() must not run from under us */
> - VM_BUG_ON_MM(hpage_collapse_test_exit(mm), mm);
> + VM_BUG_ON_MM(khugepaged_test_exit(mm), mm);
> if (unlikely(test_and_set_bit(MMF_VM_HUGEPAGE, &mm->flags)))
> return;
>
> @@ -503,7 +503,7 @@ void __khugepaged_exit(struct mm_struct *mm)
> } else if (mm_slot) {
> /*
> * This is required to serialize against
> - * hpage_collapse_test_exit() (which is guaranteed to run
> + * khugepaged_test_exit() (which is guaranteed to run
> * under mmap sem read mode). Stop here (after we return all
> * pagetables will be destroyed) until khugepaged has finished
> * working on the pagetables under the mmap_lock.
> @@ -851,7 +851,7 @@ struct collapse_control khugepaged_collapse_control = {
> .is_khugepaged = true,
> };
>
> -static bool hpage_collapse_scan_abort(int nid, struct collapse_control *cc)
> +static bool khugepaged_scan_abort(int nid, struct collapse_control *cc)
> {
> int i;
>
> @@ -886,7 +886,7 @@ static inline gfp_t alloc_hugepage_khugepaged_gfpmask(void)
> }
>
> #ifdef CONFIG_NUMA
> -static int hpage_collapse_find_target_node(struct collapse_control *cc)
> +static int khugepaged_find_target_node(struct collapse_control *cc)
> {
> int nid, target_node = 0, max_value = 0;
>
> @@ -905,7 +905,7 @@ static int hpage_collapse_find_target_node(struct collapse_control *cc)
> return target_node;
> }
> #else
> -static int hpage_collapse_find_target_node(struct collapse_control *cc)
> +static int khugepaged_find_target_node(struct collapse_control *cc)
> {
> return 0;
> }
> @@ -925,7 +925,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
> struct vm_area_struct *vma;
> unsigned long tva_flags = cc->is_khugepaged ? TVA_ENFORCE_SYSFS : 0;
>
> - if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
> + if (unlikely(khugepaged_test_exit_or_disable(mm)))
> return SCAN_ANY_PROCESS;
>
> *vmap = vma = find_vma(mm, address);
> @@ -992,7 +992,7 @@ static int check_pmd_still_valid(struct mm_struct *mm,
>
> /*
> * Bring missing pages in from swap, to complete THP collapse.
> - * Only done if hpage_collapse_scan_pmd believes it is worthwhile.
> + * Only done if khugepaged_scan_pmd believes it is worthwhile.
> *
> * Called and returns without pte mapped or spinlocks held.
> * Returns result: if not SCAN_SUCCEED, mmap_lock has been released.
> @@ -1078,7 +1078,7 @@ static int alloc_charge_folio(struct folio **foliop, struct mm_struct *mm,
> {
> gfp_t gfp = (cc->is_khugepaged ? alloc_hugepage_khugepaged_gfpmask() :
> GFP_TRANSHUGE);
> - int node = hpage_collapse_find_target_node(cc);
> + int node = khugepaged_find_target_node(cc);
> struct folio *folio;
>
> folio = __folio_alloc(gfp, HPAGE_PMD_ORDER, node, &cc->alloc_nmask);
> @@ -1264,7 +1264,7 @@ static int collapse_huge_page(struct mm_struct *mm, unsigned long address,
> return result;
> }
>
> -static int hpage_collapse_scan_pmd(struct mm_struct *mm,
> +static int khugepaged_scan_pmd(struct mm_struct *mm,
> struct vm_area_struct *vma,
> unsigned long address, bool *mmap_locked,
> struct collapse_control *cc)
> @@ -1378,7 +1378,7 @@ static int hpage_collapse_scan_pmd(struct mm_struct *mm,
> * hit record.
> */
> node = folio_nid(folio);
> - if (hpage_collapse_scan_abort(node, cc)) {
> + if (khugepaged_scan_abort(node, cc)) {
> result = SCAN_SCAN_ABORT;
> goto out_unmap;
> }
> @@ -1447,7 +1447,7 @@ static void collect_mm_slot(struct khugepaged_mm_slot *mm_slot)
>
> lockdep_assert_held(&khugepaged_mm_lock);
>
> - if (hpage_collapse_test_exit(mm)) {
> + if (khugepaged_test_exit(mm)) {
> /* free mm_slot */
> hash_del(&slot->hash);
> list_del(&slot->mm_node);
> @@ -1742,7 +1742,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
> if (find_pmd_or_thp_or_none(mm, addr, &pmd) != SCAN_SUCCEED)
> continue;
>
> - if (hpage_collapse_test_exit(mm))
> + if (khugepaged_test_exit(mm))
> continue;
> /*
> * When a vma is registered with uffd-wp, we cannot recycle
> @@ -2264,7 +2264,7 @@ static int collapse_file(struct mm_struct *mm, unsigned long addr,
> return result;
> }
>
> -static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
> +static int khugepaged_scan_file(struct mm_struct *mm, unsigned long addr,
> struct file *file, pgoff_t start,
> struct collapse_control *cc)
> {
> @@ -2309,7 +2309,7 @@ static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
> }
>
> node = folio_nid(folio);
> - if (hpage_collapse_scan_abort(node, cc)) {
> + if (khugepaged_scan_abort(node, cc)) {
> result = SCAN_SCAN_ABORT;
> break;
> }
> @@ -2355,7 +2355,7 @@ static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
> return result;
> }
> #else
> -static int hpage_collapse_scan_file(struct mm_struct *mm, unsigned long addr,
> +static int khugepaged_scan_file(struct mm_struct *mm, unsigned long addr,
> struct file *file, pgoff_t start,
> struct collapse_control *cc)
> {
> @@ -2383,19 +2383,19 @@ static int khugepaged_collapse_single_pmd(unsigned long addr,
>
> mmap_read_unlock(mm);
> *mmap_locked = false;
> - result = hpage_collapse_scan_file(mm, addr, file, pgoff,
> + result = khugepaged_scan_file(mm, addr, file, pgoff,
> cc);
> fput(file);
> if (result == SCAN_PTE_MAPPED_HUGEPAGE) {
> mmap_read_lock(mm);
> - if (hpage_collapse_test_exit_or_disable(mm))
> + if (khugepaged_test_exit_or_disable(mm))
> goto end;
> result = collapse_pte_mapped_thp(mm, addr,
> !cc->is_khugepaged);
> mmap_read_unlock(mm);
> }
> } else {
> - result = hpage_collapse_scan_pmd(mm, vma, addr,
> + result = khugepaged_scan_pmd(mm, vma, addr,
> mmap_locked, cc);
> }
> if (cc->is_khugepaged && result == SCAN_SUCCEED)
> @@ -2443,7 +2443,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
> goto breakouterloop_mmap_lock;
>
> progress++;
> - if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
> + if (unlikely(khugepaged_test_exit_or_disable(mm)))
> goto breakouterloop;
>
> vma_iter_init(&vmi, mm, khugepaged_scan.address);
> @@ -2451,7 +2451,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
> unsigned long hstart, hend;
>
> cond_resched();
> - if (unlikely(hpage_collapse_test_exit_or_disable(mm))) {
> + if (unlikely(khugepaged_test_exit_or_disable(mm))) {
> progress++;
> break;
> }
> @@ -2473,7 +2473,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
> bool mmap_locked = true;
>
> cond_resched();
> - if (unlikely(hpage_collapse_test_exit_or_disable(mm)))
> + if (unlikely(khugepaged_test_exit_or_disable(mm)))
> goto breakouterloop;
>
> VM_BUG_ON(khugepaged_scan.address < hstart ||
> @@ -2509,7 +2509,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages, int *result,
> * Release the current mm_slot if this mm is about to die, or
> * if we scanned all vmas of this mm.
> */
> - if (hpage_collapse_test_exit(mm) || !vma) {
> + if (khugepaged_test_exit(mm) || !vma) {
> /*
> * Make sure that if mm_users is reaching zero while
> * khugepaged runs here, khugepaged_exit will find
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