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Date: Fri, 5 Jan 2024 15:43:04 +0800
From: Kairui Song <ryncsn@...il.com>
To: "Huang, Ying" <ying.huang@...el.com>
Cc: linux-mm@...ck.org, Andrew Morton <akpm@...ux-foundation.org>,
Chris Li <chrisl@...nel.org>, Hugh Dickins <hughd@...gle.com>,
Johannes Weiner <hannes@...xchg.org>, Matthew Wilcox <willy@...radead.org>, Michal Hocko <mhocko@...e.com>,
Yosry Ahmed <yosryahmed@...gle.com>, David Hildenbrand <david@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/9] mm/swap: move no readahead swapin code to a
stand-alone helper
Huang, Ying <ying.huang@...el.com> 于2024年1月4日周四 15:31写道：
>
> Kairui Song <ryncsn@...il.com> writes:
>
> > From: Kairui Song <kasong@...cent.com>
> >
> > No feature change, simply move the routine to a standalone function to
> > be re-used later. The error path handling is copied from the "out_page"
> > label, to make the code change minimized for easier reviewing.
> >
> > Signed-off-by: Kairui Song <kasong@...cent.com>
> > ---
> > mm/memory.c | 32 ++++----------------------------
> > mm/swap.h | 8 ++++++++
> > mm/swap_state.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
> > 3 files changed, 59 insertions(+), 28 deletions(-)
> >
> > diff --git a/mm/memory.c b/mm/memory.c
> > index a0a50d3754f0..0165c8cad489 100644
> > --- a/mm/memory.c
> > +++ b/mm/memory.c
> > @@ -3803,7 +3803,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
> > swp_entry_t entry;
> > pte_t pte;
> > vm_fault_t ret = 0;
> > - void *shadow = NULL;
> >
> > if (!pte_unmap_same(vmf))
> > goto out;
> > @@ -3867,33 +3866,10 @@ vm_fault_t do_swap_page(struct vm_fault *vmf)
> > if (!folio) {
> > if (data_race(si->flags & SWP_SYNCHRONOUS_IO) &&
> > __swap_count(entry) == 1) {
> > - /* skip swapcache */
> > - folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0,
> > - vma, vmf->address, false);
> > - page = &folio->page;
> > - if (folio) {
> > - __folio_set_locked(folio);
> > - __folio_set_swapbacked(folio);
> > -
> > - if (mem_cgroup_swapin_charge_folio(folio,
> > - vma->vm_mm, GFP_KERNEL,
> > - entry)) {
> > - ret = VM_FAULT_OOM;
> > - goto out_page;
> > - }
> > - mem_cgroup_swapin_uncharge_swap(entry);
> > -
> > - shadow = get_shadow_from_swap_cache(entry);
> > - if (shadow)
> > - workingset_refault(folio, shadow);
> > -
> > - folio_add_lru(folio);
> > -
> > - /* To provide entry to swap_read_folio() */
> > - folio->swap = entry;
> > - swap_read_folio(folio, true, NULL);
> > - folio->private = NULL;
> > - }
> > + /* skip swapcache and readahead */
> > + folio = swapin_direct(entry, GFP_HIGHUSER_MOVABLE, vmf);
> > + if (folio)
> > + page = &folio->page;
> > } else {
> > page = swapin_readahead(entry, GFP_HIGHUSER_MOVABLE,
> > vmf);
> > diff --git a/mm/swap.h b/mm/swap.h
> > index 758c46ca671e..83eab7b67e77 100644
> > --- a/mm/swap.h
> > +++ b/mm/swap.h
> > @@ -56,6 +56,8 @@ struct folio *swap_cluster_readahead(swp_entry_t entry, gfp_t flag,
> > struct mempolicy *mpol, pgoff_t ilx);
> > struct page *swapin_readahead(swp_entry_t entry, gfp_t flag,
> > struct vm_fault *vmf);
> > +struct folio *swapin_direct(swp_entry_t entry, gfp_t flag,
> > + struct vm_fault *vmf);
> >
> > static inline unsigned int folio_swap_flags(struct folio *folio)
> > {
> > @@ -86,6 +88,12 @@ static inline struct folio *swap_cluster_readahead(swp_entry_t entry,
> > return NULL;
> > }
> >
> > +struct folio *swapin_direct(swp_entry_t entry, gfp_t flag,
> > + struct vm_fault *vmf)
> > +{
> > + return NULL;
> > +}
> > +
> > static inline struct page *swapin_readahead(swp_entry_t swp, gfp_t gfp_mask,
> > struct vm_fault *vmf)
> > {
> > diff --git a/mm/swap_state.c b/mm/swap_state.c
> > index e671266ad772..24cb93ed5081 100644
> > --- a/mm/swap_state.c
> > +++ b/mm/swap_state.c
> > @@ -861,6 +861,53 @@ static struct folio *swap_vma_readahead(swp_entry_t targ_entry, gfp_t gfp_mask,
> > return folio;
> > }
> >
> > +/**
> > + * swapin_direct - swap in folios skipping swap cache and readahead
>
> swap in a folio ...
>
> > + * @entry: swap entry of this memory
> > + * @gfp_mask: memory allocation flags
> > + * @vmf: fault information
> > + *
> > + * Returns the struct folio for entry and addr after the swap entry is read
> > + * in.
> > + */
> > +struct folio *swapin_direct(swp_entry_t entry, gfp_t gfp_mask,
> > + struct vm_fault *vmf)
> > +{
> > + struct vm_area_struct *vma = vmf->vma;
> > + struct folio *folio;
> > + void *shadow = NULL;
> > +
> > + /* skip swapcache */
> > + folio = vma_alloc_folio(GFP_HIGHUSER_MOVABLE, 0,
>
> You passed gfp_mask in, but don't use it.
>
Thanks, will fix these.
> --
> Best Regards,
> Huang, Ying
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