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Date: Tue, 7 Jun 2016 11:12:42 +0200
From: Michal Hocko <mhocko@...nel.org>
To: Johannes Weiner <hannes@...xchg.org>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Andrew Morton <akpm@...ux-foundation.org>,
Rik van Riel <riel@...hat.com>, Mel Gorman <mgorman@...e.de>,
Andrea Arcangeli <aarcange@...hat.com>,
Andi Kleen <andi@...stfloor.org>,
Tim Chen <tim.c.chen@...ux.intel.com>, kernel-team@...com
Subject: Re: [PATCH 03/10] mm: fold and remove lru_cache_add_anon() and
lru_cache_add_file()
On Mon 06-06-16 15:48:29, Johannes Weiner wrote:
> They're the same function, and for the purpose of all callers they are
> equivalent to lru_cache_add().
>
> Signed-off-by: Johannes Weiner <hannes@...xchg.org>
Acked-by: Michal Hocko <mhocko@...e.com>
> ---
> fs/cifs/file.c | 10 +++++-----
> fs/fuse/dev.c | 2 +-
> include/linux/swap.h | 2 --
> mm/shmem.c | 4 ++--
> mm/swap.c | 40 +++++++++-------------------------------
> mm/swap_state.c | 2 +-
> 6 files changed, 18 insertions(+), 42 deletions(-)
>
> diff --git a/fs/cifs/file.c b/fs/cifs/file.c
> index 9793ae0bcaa2..232390879640 100644
> --- a/fs/cifs/file.c
> +++ b/fs/cifs/file.c
> @@ -3261,7 +3261,7 @@ cifs_readv_complete(struct work_struct *work)
> for (i = 0; i < rdata->nr_pages; i++) {
> struct page *page = rdata->pages[i];
>
> - lru_cache_add_file(page);
> + lru_cache_add(page);
>
> if (rdata->result == 0 ||
> (rdata->result == -EAGAIN && got_bytes)) {
> @@ -3321,7 +3321,7 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
> * fill them until the writes are flushed.
> */
> zero_user(page, 0, PAGE_SIZE);
> - lru_cache_add_file(page);
> + lru_cache_add(page);
> flush_dcache_page(page);
> SetPageUptodate(page);
> unlock_page(page);
> @@ -3331,7 +3331,7 @@ cifs_readpages_read_into_pages(struct TCP_Server_Info *server,
> continue;
> } else {
> /* no need to hold page hostage */
> - lru_cache_add_file(page);
> + lru_cache_add(page);
> unlock_page(page);
> put_page(page);
> rdata->pages[i] = NULL;
> @@ -3488,7 +3488,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
> /* best to give up if we're out of mem */
> list_for_each_entry_safe(page, tpage, &tmplist, lru) {
> list_del(&page->lru);
> - lru_cache_add_file(page);
> + lru_cache_add(page);
> unlock_page(page);
> put_page(page);
> }
> @@ -3518,7 +3518,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
> add_credits_and_wake_if(server, rdata->credits, 0);
> for (i = 0; i < rdata->nr_pages; i++) {
> page = rdata->pages[i];
> - lru_cache_add_file(page);
> + lru_cache_add(page);
> unlock_page(page);
> put_page(page);
> }
> diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
> index cbece1221417..c7264d4a7f3f 100644
> --- a/fs/fuse/dev.c
> +++ b/fs/fuse/dev.c
> @@ -900,7 +900,7 @@ static int fuse_try_move_page(struct fuse_copy_state *cs, struct page **pagep)
> get_page(newpage);
>
> if (!(buf->flags & PIPE_BUF_FLAG_LRU))
> - lru_cache_add_file(newpage);
> + lru_cache_add(newpage);
>
> err = 0;
> spin_lock(&cs->req->waitq.lock);
> diff --git a/include/linux/swap.h b/include/linux/swap.h
> index 0af2bb2028fd..38fe1e91ba55 100644
> --- a/include/linux/swap.h
> +++ b/include/linux/swap.h
> @@ -296,8 +296,6 @@ extern unsigned long nr_free_pagecache_pages(void);
>
> /* linux/mm/swap.c */
> extern void lru_cache_add(struct page *);
> -extern void lru_cache_add_anon(struct page *page);
> -extern void lru_cache_add_file(struct page *page);
> extern void lru_add_page_tail(struct page *page, struct page *page_tail,
> struct lruvec *lruvec, struct list_head *head);
> extern void activate_page(struct page *);
> diff --git a/mm/shmem.c b/mm/shmem.c
> index e418a995427d..ff210317022d 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -1098,7 +1098,7 @@ static int shmem_replace_page(struct page **pagep, gfp_t gfp,
> oldpage = newpage;
> } else {
> mem_cgroup_migrate(oldpage, newpage);
> - lru_cache_add_anon(newpage);
> + lru_cache_add(newpage);
> *pagep = newpage;
> }
>
> @@ -1289,7 +1289,7 @@ repeat:
> goto decused;
> }
> mem_cgroup_commit_charge(page, memcg, false, false);
> - lru_cache_add_anon(page);
> + lru_cache_add(page);
>
> spin_lock(&info->lock);
> info->alloced++;
> diff --git a/mm/swap.c b/mm/swap.c
> index d810c3d95c97..d2786a6308dd 100644
> --- a/mm/swap.c
> +++ b/mm/swap.c
> @@ -386,36 +386,6 @@ void mark_page_accessed(struct page *page)
> }
> EXPORT_SYMBOL(mark_page_accessed);
>
> -static void __lru_cache_add(struct page *page)
> -{
> - struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
> -
> - get_page(page);
> - if (!pagevec_space(pvec))
> - __pagevec_lru_add(pvec);
> - pagevec_add(pvec, page);
> - put_cpu_var(lru_add_pvec);
> -}
> -
> -/**
> - * lru_cache_add: add a page to the page lists
> - * @page: the page to add
> - */
> -void lru_cache_add_anon(struct page *page)
> -{
> - if (PageActive(page))
> - ClearPageActive(page);
> - __lru_cache_add(page);
> -}
> -
> -void lru_cache_add_file(struct page *page)
> -{
> - if (PageActive(page))
> - ClearPageActive(page);
> - __lru_cache_add(page);
> -}
> -EXPORT_SYMBOL(lru_cache_add_file);
> -
> /**
> * lru_cache_add - add a page to a page list
> * @page: the page to be added to the LRU.
> @@ -427,10 +397,18 @@ EXPORT_SYMBOL(lru_cache_add_file);
> */
> void lru_cache_add(struct page *page)
> {
> + struct pagevec *pvec = &get_cpu_var(lru_add_pvec);
> +
> VM_BUG_ON_PAGE(PageActive(page) && PageUnevictable(page), page);
> VM_BUG_ON_PAGE(PageLRU(page), page);
> - __lru_cache_add(page);
> +
> + get_page(page);
> + if (!pagevec_space(pvec))
> + __pagevec_lru_add(pvec);
> + pagevec_add(pvec, page);
> + put_cpu_var(lru_add_pvec);
> }
> +EXPORT_SYMBOL(lru_cache_add);
>
> /**
> * add_page_to_unevictable_list - add a page to the unevictable list
> diff --git a/mm/swap_state.c b/mm/swap_state.c
> index 0d457e7db8d6..5400f814ae12 100644
> --- a/mm/swap_state.c
> +++ b/mm/swap_state.c
> @@ -365,7 +365,7 @@ struct page *__read_swap_cache_async(swp_entry_t entry, gfp_t gfp_mask,
> /*
> * Initiate read into locked page and return.
> */
> - lru_cache_add_anon(new_page);
> + lru_cache_add(new_page);
> *new_page_allocated = true;
> return new_page;
> }
> --
> 2.8.3
--
Michal Hocko
SUSE Labs
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