Re: [RFC 4/4] mm: Enhance per process reclaim

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Hello Minchan

On Wed, Apr 3, 2013 at 2:23 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote:
> Hey Michael,
>
> On Tue, Apr 02, 2013 at 03:25:25PM +0200, Michael Kerrisk wrote:
>> Minchan,
>>
>> On Mon, Mar 25, 2013 at 7:21 AM, Minchan Kim <minchan@xxxxxxxxxx> wrote:
>> >
>> > Some pages could be shared by several processes. (ex, libc)
>> > In case of that, it's too bad to reclaim them from the beginnig.
>> >
>> > This patch causes VM to keep them on memory until last task
>> > try to reclaim them so shared pages will be reclaimed only if
>> > all of task has gone swapping out.
>> >
>> > This feature doesn't handle non-linear mapping on ramfs because
>> > it's very time-consuming and doesn't make sure of reclaiming and
>> > not common.
>>
>> Against what tree does this patch apply? I've tries various trees,
>> including MMOTM of 26 March, and encounter this error:
>>
>>   CC      mm/ksm.o
>> mm/ksm.c: In function ‘try_to_unmap_ksm’:
>> mm/ksm.c:1970:32: error: ‘vma’ undeclared (first use in this function)
>> mm/ksm.c:1970:32: note: each undeclared identifier is reported only
>> once for each function it appears in
>> make[1]: *** [mm/ksm.o] Error 1
>> make: *** [mm] Error 2
>
> I did it based on mmotm-2013-03-22-15-21 and you found build problem.
> Could you apply below patch? I will fix up below in next spin.
> Thanks for the testing!

This is getting confusing. Was that a patch on top of the other 4
patches? I assume so. I applied all 5 patches on
mmotm-2013-03-22-15-21, but still get a build error:

mm/memcontrol.c: In function ‘mem_cgroup_move_parent’:
mm/memcontrol.c:3868:2: error: implicit declaration of function
‘isolate_lru_page’ [-Werror=implicit-function-declaration]
mm/memcontrol.c:3892:2: error: implicit declaration of function
‘putback_lru_page’ [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[1]: *** [mm/memcontrol.o] Error 1
make[1]: *** Waiting for unfinished jobs....
make: *** [mm] Error 2
make: *** Waiting for unfinished jobs....

Cheers,

Michael



> From 0934270618ccd4883d6bb05653c664a385fb9441 Mon Sep 17 00:00:00 2001
> From: Minchan Kim <minchan@xxxxxxxxxx>
> Date: Wed, 3 Apr 2013 09:19:49 +0900
> Subject: [PATCH] fix: compile error for CONFIG_KSM
>
> Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
> ---
>  include/linux/rmap.h | 2 ++
>  mm/ksm.c             | 2 +-
>  2 files changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/rmap.h b/include/linux/rmap.h
> index 6c7d030..7bcf090 100644
> --- a/include/linux/rmap.h
> +++ b/include/linux/rmap.h
> @@ -14,6 +14,8 @@ extern int isolate_lru_page(struct page *page);
>  extern void putback_lru_page(struct page *page);
>  extern unsigned long reclaim_pages_from_list(struct list_head *page_list,
>                                              struct vm_area_struct *vma);
> +extern unsigned long vma_address(struct page *page,
> +                               struct vm_area_struct *vma);
>
>  /*
>   * The anon_vma heads a list of private "related" vmas, to scan if
> diff --git a/mm/ksm.c b/mm/ksm.c
> index 1a90d13..44de936 100644
> --- a/mm/ksm.c
> +++ b/mm/ksm.c
> @@ -1967,7 +1967,7 @@ int try_to_unmap_ksm(struct page *page, enum ttu_flags flags,
>
>         if (target_vma) {
>                 unsigned long address = vma_address(page, target_vma);
> -               ret = try_to_unmap_one(page, vma, address, flags);
> +               ret = try_to_unmap_one(page, target_vma, address, flags);
>                 goto out;
>         }
>  again:
> --
> 1.8.2
>
>>
>> Cheers,
>>
>> Michael
>>
>>
>> > Signed-off-by: Sangseok Lee <sangseok.lee@xxxxxxx>
>> > Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
>> > ---
>> >  fs/proc/task_mmu.c   |  2 +-
>> >  include/linux/ksm.h  |  6 ++++--
>> >  include/linux/rmap.h |  8 +++++---
>> >  mm/ksm.c             |  9 +++++++-
>> >  mm/memory-failure.c  |  2 +-
>> >  mm/migrate.c         |  6 ++++--
>> >  mm/rmap.c            | 58 +++++++++++++++++++++++++++++++++++++---------------
>> >  mm/vmscan.c          | 14 +++++++++++--
>> >  8 files changed, 77 insertions(+), 28 deletions(-)
>> >
>> > diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
>> > index c3713a4..7f6aaf5 100644
>> > --- a/fs/proc/task_mmu.c
>> > +++ b/fs/proc/task_mmu.c
>> > @@ -1154,7 +1154,7 @@ cont:
>> >                         break;
>> >         }
>> >         pte_unmap_unlock(pte - 1, ptl);
>> > -       reclaim_pages_from_list(&page_list);
>> > +       reclaim_pages_from_list(&page_list, vma);
>> >         if (addr != end)
>> >                 goto cont;
>> >
>> > diff --git a/include/linux/ksm.h b/include/linux/ksm.h
>> > index 45c9b6a..d8e556b 100644
>> > --- a/include/linux/ksm.h
>> > +++ b/include/linux/ksm.h
>> > @@ -75,7 +75,8 @@ struct page *ksm_might_need_to_copy(struct page *page,
>> >
>> >  int page_referenced_ksm(struct page *page,
>> >                         struct mem_cgroup *memcg, unsigned long *vm_flags);
>> > -int try_to_unmap_ksm(struct page *page, enum ttu_flags flags);
>> > +int try_to_unmap_ksm(struct page *page,
>> > +                       enum ttu_flags flags, struct vm_area_struct *vma);
>> >  int rmap_walk_ksm(struct page *page, int (*rmap_one)(struct page *,
>> >                   struct vm_area_struct *, unsigned long, void *), void *arg);
>> >  void ksm_migrate_page(struct page *newpage, struct page *oldpage);
>> > @@ -115,7 +116,8 @@ static inline int page_referenced_ksm(struct page *page,
>> >         return 0;
>> >  }
>> >
>> > -static inline int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
>> > +static inline int try_to_unmap_ksm(struct page *page,
>> > +                       enum ttu_flags flags, struct vm_area_struct *target_vma)
>> >  {
>> >         return 0;
>> >  }
>> > diff --git a/include/linux/rmap.h b/include/linux/rmap.h
>> > index a24e34e..6c7d030 100644
>> > --- a/include/linux/rmap.h
>> > +++ b/include/linux/rmap.h
>> > @@ -12,7 +12,8 @@
>> >
>> >  extern int isolate_lru_page(struct page *page);
>> >  extern void putback_lru_page(struct page *page);
>> > -extern unsigned long reclaim_pages_from_list(struct list_head *page_list);
>> > +extern unsigned long reclaim_pages_from_list(struct list_head *page_list,
>> > +                                            struct vm_area_struct *vma);
>> >
>> >  /*
>> >   * The anon_vma heads a list of private "related" vmas, to scan if
>> > @@ -192,7 +193,8 @@ int page_referenced_one(struct page *, struct vm_area_struct *,
>> >
>> >  #define TTU_ACTION(x) ((x) & TTU_ACTION_MASK)
>> >
>> > -int try_to_unmap(struct page *, enum ttu_flags flags);
>> > +int try_to_unmap(struct page *, enum ttu_flags flags,
>> > +                       struct vm_area_struct *vma);
>> >  int try_to_unmap_one(struct page *, struct vm_area_struct *,
>> >                         unsigned long address, enum ttu_flags flags);
>> >
>> > @@ -259,7 +261,7 @@ static inline int page_referenced(struct page *page, int is_locked,
>> >         return 0;
>> >  }
>> >
>> > -#define try_to_unmap(page, refs) SWAP_FAIL
>> > +#define try_to_unmap(page, refs, vma) SWAP_FAIL
>> >
>> >  static inline int page_mkclean(struct page *page)
>> >  {
>> > diff --git a/mm/ksm.c b/mm/ksm.c
>> > index 7f629e4..1a90d13 100644
>> > --- a/mm/ksm.c
>> > +++ b/mm/ksm.c
>> > @@ -1949,7 +1949,8 @@ out:
>> >         return referenced;
>> >  }
>> >
>> > -int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
>> > +int try_to_unmap_ksm(struct page *page, enum ttu_flags flags,
>> > +                       struct vm_area_struct *target_vma)
>> >  {
>> >         struct stable_node *stable_node;
>> >         struct hlist_node *hlist;
>> > @@ -1963,6 +1964,12 @@ int try_to_unmap_ksm(struct page *page, enum ttu_flags flags)
>> >         stable_node = page_stable_node(page);
>> >         if (!stable_node)
>> >                 return SWAP_FAIL;
>> > +
>> > +       if (target_vma) {
>> > +               unsigned long address = vma_address(page, target_vma);
>> > +               ret = try_to_unmap_one(page, vma, address, flags);
>> > +               goto out;
>> > +       }
>> >  again:
>> >         hlist_for_each_entry(rmap_item, hlist, &stable_node->hlist, hlist) {
>> >                 struct anon_vma *anon_vma = rmap_item->anon_vma;
>> > diff --git a/mm/memory-failure.c b/mm/memory-failure.c
>> > index ceb0c7f..f3928e4 100644
>> > --- a/mm/memory-failure.c
>> > +++ b/mm/memory-failure.c
>> > @@ -955,7 +955,7 @@ static int hwpoison_user_mappings(struct page *p, unsigned long pfn,
>> >         if (hpage != ppage)
>> >                 lock_page(ppage);
>> >
>> > -       ret = try_to_unmap(ppage, ttu);
>> > +       ret = try_to_unmap(ppage, ttu, NULL);
>> >         if (ret != SWAP_SUCCESS)
>> >                 printk(KERN_ERR "MCE %#lx: failed to unmap page (mapcount=%d)\n",
>> >                                 pfn, page_mapcount(ppage));
>> > diff --git a/mm/migrate.c b/mm/migrate.c
>> > index 6fa4ebc..aafbc66 100644
>> > --- a/mm/migrate.c
>> > +++ b/mm/migrate.c
>> > @@ -820,7 +820,8 @@ static int __unmap_and_move(struct page *page, struct page *newpage,
>> >         }
>> >
>> >         /* Establish migration ptes or remove ptes */
>> > -       try_to_unmap(page, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
>> > +       try_to_unmap(page, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS,
>> > +                       NULL);
>> >
>> >  skip_unmap:
>> >         if (!page_mapped(page))
>> > @@ -947,7 +948,8 @@ static int unmap_and_move_huge_page(new_page_t get_new_page,
>> >         if (PageAnon(hpage))
>> >                 anon_vma = page_get_anon_vma(hpage);
>> >
>> > -       try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS);
>> > +       try_to_unmap(hpage, TTU_MIGRATION|TTU_IGNORE_MLOCK|TTU_IGNORE_ACCESS,
>> > +                                               NULL);
>> >
>> >         if (!page_mapped(hpage))
>> >                 rc = move_to_new_page(new_hpage, hpage, 1, mode);
>> > diff --git a/mm/rmap.c b/mm/rmap.c
>> > index 6280da8..a880f24 100644
>> > --- a/mm/rmap.c
>> > +++ b/mm/rmap.c
>> > @@ -1435,13 +1435,16 @@ bool is_vma_temporary_stack(struct vm_area_struct *vma)
>> >
>> >  /**
>> >   * try_to_unmap_anon - unmap or unlock anonymous page using the object-based
>> > - * rmap method
>> > + * rmap method if @vma is NULL
>> >   * @page: the page to unmap/unlock
>> >   * @flags: action and flags
>> > + * @target_vma: vma for unmapping a @page
>> >   *
>> >   * Find all the mappings of a page using the mapping pointer and the vma chains
>> >   * contained in the anon_vma struct it points to.
>> >   *
>> > + * If @target_vma isn't NULL, this function unmap a page from the vma
>> > + *
>> >   * This function is only called from try_to_unmap/try_to_munlock for
>> >   * anonymous pages.
>> >   * When called from try_to_munlock(), the mmap_sem of the mm containing the vma
>> > @@ -1449,12 +1452,19 @@ bool is_vma_temporary_stack(struct vm_area_struct *vma)
>> >   * vm_flags for that VMA.  That should be OK, because that vma shouldn't be
>> >   * 'LOCKED.
>> >   */
>> > -static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
>> > +static int try_to_unmap_anon(struct page *page, enum ttu_flags flags,
>> > +                                       struct vm_area_struct *target_vma)
>> >  {
>> > +       int ret = SWAP_AGAIN;
>> > +       unsigned long address;
>> >         struct anon_vma *anon_vma;
>> >         pgoff_t pgoff;
>> >         struct anon_vma_chain *avc;
>> > -       int ret = SWAP_AGAIN;
>> > +
>> > +       if (target_vma) {
>> > +               address = vma_address(page, target_vma);
>> > +               return try_to_unmap_one(page, target_vma, address, flags);
>> > +       }
>> >
>> >         anon_vma = page_lock_anon_vma_read(page);
>> >         if (!anon_vma)
>> > @@ -1463,7 +1473,6 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
>> >         pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
>> >         anon_vma_interval_tree_foreach(avc, &anon_vma->rb_root, pgoff, pgoff) {
>> >                 struct vm_area_struct *vma = avc->vma;
>> > -               unsigned long address;
>> >
>> >                 /*
>> >                  * During exec, a temporary VMA is setup and later moved.
>> > @@ -1491,6 +1500,7 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
>> >   * try_to_unmap_file - unmap/unlock file page using the object-based rmap method
>> >   * @page: the page to unmap/unlock
>> >   * @flags: action and flags
>> > + * @target_vma: vma for unmapping @page
>> >   *
>> >   * Find all the mappings of a page using the mapping pointer and the vma chains
>> >   * contained in the address_space struct it points to.
>> > @@ -1502,7 +1512,8 @@ static int try_to_unmap_anon(struct page *page, enum ttu_flags flags)
>> >   * vm_flags for that VMA.  That should be OK, because that vma shouldn't be
>> >   * 'LOCKED.
>> >   */
>> > -static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
>> > +static int try_to_unmap_file(struct page *page, enum ttu_flags flags,
>> > +                               struct vm_area_struct *target_vma)
>> >  {
>> >         struct address_space *mapping = page->mapping;
>> >         pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT);
>> > @@ -1512,16 +1523,27 @@ static int try_to_unmap_file(struct page *page, enum ttu_flags flags)
>> >         unsigned long max_nl_cursor = 0;
>> >         unsigned long max_nl_size = 0;
>> >         unsigned int mapcount;
>> > +       unsigned long address;
>> >
>> >         if (PageHuge(page))
>> >                 pgoff = page->index << compound_order(page);
>> >
>> >         mutex_lock(&mapping->i_mmap_mutex);
>> > -       vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
>> > -               unsigned long address = vma_address(page, vma);
>> > -               ret = try_to_unmap_one(page, vma, address, flags);
>> > -               if (ret != SWAP_AGAIN || !page_mapped(page))
>> > +       if (target_vma) {
>> > +               /* We don't handle non-linear vma on ramfs */
>> > +               if (unlikely(!list_empty(&mapping->i_mmap_nonlinear)))
>> >                         goto out;
>> > +
>> > +               address = vma_address(page, target_vma);
>> > +               ret = try_to_unmap_one(page, target_vma, address, flags);
>> > +               goto out;
>> > +       } else {
>> > +               vma_interval_tree_foreach(vma, &mapping->i_mmap, pgoff, pgoff) {
>> > +                       address = vma_address(page, vma);
>> > +                       ret = try_to_unmap_one(page, vma, address, flags);
>> > +                       if (ret != SWAP_AGAIN || !page_mapped(page))
>> > +                               goto out;
>> > +               }
>> >         }
>> >
>> >         if (list_empty(&mapping->i_mmap_nonlinear))
>> > @@ -1602,9 +1624,12 @@ out:
>> >   * try_to_unmap - try to remove all page table mappings to a page
>> >   * @page: the page to get unmapped
>> >   * @flags: action and flags
>> > + * @vma : target vma for reclaim
>> >   *
>> >   * Tries to remove all the page table entries which are mapping this
>> >   * page, used in the pageout path.  Caller must hold the page lock.
>> > + * If @vma is not NULL, this function try to remove @page from only @vma
>> > + * without peeking all mapped vma for @page.
>> >   * Return values are:
>> >   *
>> >   * SWAP_SUCCESS        - we succeeded in removing all mappings
>> > @@ -1612,7 +1637,8 @@ out:
>> >   * SWAP_FAIL   - the page is unswappable
>> >   * SWAP_MLOCK  - page is mlocked.
>> >   */
>> > -int try_to_unmap(struct page *page, enum ttu_flags flags)
>> > +int try_to_unmap(struct page *page, enum ttu_flags flags,
>> > +                               struct vm_area_struct *vma)
>> >  {
>> >         int ret;
>> >
>> > @@ -1620,11 +1646,11 @@ int try_to_unmap(struct page *page, enum ttu_flags flags)
>> >         VM_BUG_ON(!PageHuge(page) && PageTransHuge(page));
>> >
>> >         if (unlikely(PageKsm(page)))
>> > -               ret = try_to_unmap_ksm(page, flags);
>> > +               ret = try_to_unmap_ksm(page, flags, vma);
>> >         else if (PageAnon(page))
>> > -               ret = try_to_unmap_anon(page, flags);
>> > +               ret = try_to_unmap_anon(page, flags, vma);
>> >         else
>> > -               ret = try_to_unmap_file(page, flags);
>> > +               ret = try_to_unmap_file(page, flags, vma);
>> >         if (ret != SWAP_MLOCK && !page_mapped(page))
>> >                 ret = SWAP_SUCCESS;
>> >         return ret;
>> > @@ -1650,11 +1676,11 @@ int try_to_munlock(struct page *page)
>> >         VM_BUG_ON(!PageLocked(page) || PageLRU(page));
>> >
>> >         if (unlikely(PageKsm(page)))
>> > -               return try_to_unmap_ksm(page, TTU_MUNLOCK);
>> > +               return try_to_unmap_ksm(page, TTU_MUNLOCK, NULL);
>> >         else if (PageAnon(page))
>> > -               return try_to_unmap_anon(page, TTU_MUNLOCK);
>> > +               return try_to_unmap_anon(page, TTU_MUNLOCK, NULL);
>> >         else
>> > -               return try_to_unmap_file(page, TTU_MUNLOCK);
>> > +               return try_to_unmap_file(page, TTU_MUNLOCK, NULL);
>> >  }
>> >
>> >  void __put_anon_vma(struct anon_vma *anon_vma)
>> > diff --git a/mm/vmscan.c b/mm/vmscan.c
>> > index 367d0f4..df9c4d3 100644
>> > --- a/mm/vmscan.c
>> > +++ b/mm/vmscan.c
>> > @@ -92,6 +92,13 @@ struct scan_control {
>> >          * are scanned.
>> >          */
>> >         nodemask_t      *nodemask;
>> > +
>> > +       /*
>> > +        * Reclaim pages from a vma. If the page is shared by other tasks
>> > +        * it is zapped from a vma without reclaim so it ends up remaining
>> > +        * on memory until last task zap it.
>> > +        */
>> > +       struct vm_area_struct *target_vma;
>> >  };
>> >
>> >  #define lru_to_page(_head) (list_entry((_head)->prev, struct page, lru))
>> > @@ -793,7 +800,8 @@ static unsigned long shrink_page_list(struct list_head *page_list,
>> >                  * processes. Try to unmap it here.
>> >                  */
>> >                 if (page_mapped(page) && mapping) {
>> > -                       switch (try_to_unmap(page, ttu_flags)) {
>> > +                       switch (try_to_unmap(page,
>> > +                                       ttu_flags, sc->target_vma)) {
>> >                         case SWAP_FAIL:
>> >                                 goto activate_locked;
>> >                         case SWAP_AGAIN:
>> > @@ -1000,13 +1008,15 @@ unsigned long reclaim_clean_pages_from_list(struct zone *zone,
>> >  }
>> >
>> >  #ifdef CONFIG_PROCESS_RECLAIM
>> > -unsigned long reclaim_pages_from_list(struct list_head *page_list)
>> > +unsigned long reclaim_pages_from_list(struct list_head *page_list,
>> > +                                       struct vm_area_struct *vma)
>> >  {
>> >         struct scan_control sc = {
>> >                 .gfp_mask = GFP_KERNEL,
>> >                 .priority = DEF_PRIORITY,
>> >                 .may_unmap = 1,
>> >                 .may_swap = 1,
>> > +               .target_vma = vma,
>> >         };
>> >
>> >         unsigned long nr_reclaimed;
>> > --
>> > 1.8.2
>> >
>> > --
>> > To unsubscribe, send a message with 'unsubscribe linux-mm' in
>> > the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
>> > see: http://www.linux-mm.org/ .
>> > Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
>>
>> --
>> To unsubscribe, send a message with 'unsubscribe linux-mm' in
>> the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
>> see: http://www.linux-mm.org/ .
>> Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>
>
> --
> Kind regards,
> Minchan Kim



--
Michael Kerrisk
Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
Author of "The Linux Programming Interface"; http://man7.org/tlpi/

--
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