From: "Huang\, Ying" <ying.huang@intel.com> To: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: "'Huang\, Ying'" <ying.huang@intel.com>, "'Andrew Morton'" <akpm@linux-foundation.org>, <tim.c.chen@intel.com>, <dave.hansen@intel.com>, <andi.kleen@intel.com>, <aaron.lu@intel.com>, <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>, "'Andrea Arcangeli'" <aarcange@redhat.com>, "'Kirill A . Shutemov'" <kirill.shutemov@linux.intel.com>, "'Ebru Akagunduz'" <ebru.akagunduz@gmail.com> Subject: Re: [PATCH -v4 RESEND 8/9] mm, THP, swap: Support to split THP in swap cache Date: Mon, 31 Oct 2016 09:26:59 +0800 [thread overview] Message-ID: <871syx71gc.fsf@yhuang-dev.intel.com> (raw) In-Reply-To: <052901d23104$a6473380$f2d59a80$@alibaba-inc.com> (Hillf Danton's message of "Fri, 28 Oct 2016 18:18:34 +0800") Hillf Danton <hillf.zj@alibaba-inc.com> writes: > On Friday, October 28, 2016 1:56 PM Huang, Ying wrote: >> @@ -2016,10 +2021,12 @@ int page_trans_huge_mapcount(struct page *page, int *total_mapcount) >> /* Racy check whether the huge page can be split */ >> bool can_split_huge_page(struct page *page) >> { >> - int extra_pins = 0; >> + int extra_pins; >> >> /* Additional pins from radix tree */ >> - if (!PageAnon(page)) >> + if (PageAnon(page)) >> + extra_pins = PageSwapCache(page) ? HPAGE_PMD_NR : 0; >> + else >> extra_pins = HPAGE_PMD_NR; > > extra_pins is computed in this newly added helper. > >> return total_mapcount(page) == page_count(page) - extra_pins - 1; >> } >> @@ -2072,7 +2079,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) >> ret = -EBUSY; >> goto out; >> } >> - extra_pins = 0; >> + extra_pins = PageSwapCache(head) ? HPAGE_PMD_NR : 0; > > It is also computed at the call site, so can we fold them into one? Sounds reasonable. I will add another argument to can_split_huge_page() to return extra_pins, so we can avoid duplicated code and calculation. Best Regards, Huang, Ying >> mapping = NULL; >> anon_vma_lock_write(anon_vma); >> } else { >> -- >> 2.9.3
WARNING: multiple messages have this Message-ID (diff)
From: "Huang\, Ying" <ying.huang@intel.com> To: Hillf Danton <hillf.zj@alibaba-inc.com> Cc: "'Huang, Ying'" <ying.huang@intel.com>, 'Andrew Morton' <akpm@linux-foundation.org>, tim.c.chen@intel.com, dave.hansen@intel.com, andi.kleen@intel.com, aaron.lu@intel.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org, 'Andrea Arcangeli' <aarcange@redhat.com>, "'Kirill A . Shutemov'" <kirill.shutemov@linux.intel.com>, 'Ebru Akagunduz' <ebru.akagunduz@gmail.com> Subject: Re: [PATCH -v4 RESEND 8/9] mm, THP, swap: Support to split THP in swap cache Date: Mon, 31 Oct 2016 09:26:59 +0800 [thread overview] Message-ID: <871syx71gc.fsf@yhuang-dev.intel.com> (raw) In-Reply-To: <052901d23104$a6473380$f2d59a80$@alibaba-inc.com> (Hillf Danton's message of "Fri, 28 Oct 2016 18:18:34 +0800") Hillf Danton <hillf.zj@alibaba-inc.com> writes: > On Friday, October 28, 2016 1:56 PM Huang, Ying wrote: >> @@ -2016,10 +2021,12 @@ int page_trans_huge_mapcount(struct page *page, int *total_mapcount) >> /* Racy check whether the huge page can be split */ >> bool can_split_huge_page(struct page *page) >> { >> - int extra_pins = 0; >> + int extra_pins; >> >> /* Additional pins from radix tree */ >> - if (!PageAnon(page)) >> + if (PageAnon(page)) >> + extra_pins = PageSwapCache(page) ? HPAGE_PMD_NR : 0; >> + else >> extra_pins = HPAGE_PMD_NR; > > extra_pins is computed in this newly added helper. > >> return total_mapcount(page) == page_count(page) - extra_pins - 1; >> } >> @@ -2072,7 +2079,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list) >> ret = -EBUSY; >> goto out; >> } >> - extra_pins = 0; >> + extra_pins = PageSwapCache(head) ? HPAGE_PMD_NR : 0; > > It is also computed at the call site, so can we fold them into one? Sounds reasonable. I will add another argument to can_split_huge_page() to return extra_pins, so we can avoid duplicated code and calculation. Best Regards, Huang, Ying >> mapping = NULL; >> anon_vma_lock_write(anon_vma); >> } else { >> -- >> 2.9.3 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-10-31 1:27 UTC|newest] Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-10-28 5:55 [PATCH -v4 RESEND 0/9] THP swap: Delay splitting THP during swapping out Huang, Ying 2016-10-28 5:55 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 1/9] mm, swap: Make swap cluster size same of THP size on x86_64 Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 2/9] mm, memcg: Support to charge/uncharge multiple swap entries Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 3/9] mm, THP, swap: Add swap cluster allocate/free functions Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 4/9] mm, THP, swap: Add get_huge_swap_page() Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 5/9] mm, THP, swap: Support to clear SWAP_HAS_CACHE for huge page Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 6/9] mm, THP, swap: Support to add/delete THP to/from swap cache Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 8:08 ` Hillf Danton 2016-10-28 8:08 ` Hillf Danton 2016-10-28 8:30 ` Huang, Ying 2016-10-28 8:30 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 7/9] mm, THP: Add can_split_huge_page() Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 8/9] mm, THP, swap: Support to split THP in swap cache Huang, Ying 2016-10-28 5:56 ` Huang, Ying 2016-10-28 10:18 ` Hillf Danton 2016-10-28 10:18 ` Hillf Danton 2016-10-31 1:26 ` Huang, Ying [this message] 2016-10-31 1:26 ` Huang, Ying 2016-10-28 5:56 ` [PATCH -v4 RESEND 9/9] mm, THP, swap: Delay splitting THP during swap out Huang, Ying 2016-10-28 5:56 ` Huang, Ying
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