From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> To: Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrew Morton <akpm@linux-foundation.org> Cc: Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Hugh Dickins <hughd@google.com>, Davidlohr Bueso <davidlohr.bueso@hp.com>, David Gibson <david@gibson.dropbear.id.au>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim <js1304@gmail.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com> Subject: Re: [PATCH 1/9] mm, hugetlb: move up the code which check availability of free huge page Date: Mon, 15 Jul 2013 19:31:33 +0530 [thread overview] Message-ID: <87a9lnkjlu.fsf@linux.vnet.ibm.com> (raw) In-Reply-To: <1373881967-16153-2-git-send-email-iamjoonsoo.kim@lge.com> Joonsoo Kim <iamjoonsoo.kim@lge.com> writes: > We don't need to proceede the processing if we don't have any usable > free huge page. So move this code up. I guess you can also mention that since we are holding hugetlb_lock hstate values can't change. Also. > > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index e2bfbf7..d87f70b 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -539,10 +539,6 @@ static struct page *dequeue_huge_page_vma(struct hstate *h, > struct zoneref *z; > unsigned int cpuset_mems_cookie; > > -retry_cpuset: > - cpuset_mems_cookie = get_mems_allowed(); > - zonelist = huge_zonelist(vma, address, > - htlb_alloc_mask, &mpol, &nodemask); > /* > * A child process with MAP_PRIVATE mappings created by their parent > * have no page reserves. This check ensures that reservations are > @@ -550,11 +546,16 @@ retry_cpuset: > */ > if (!vma_has_reserves(vma) && > h->free_huge_pages - h->resv_huge_pages == 0) > - goto err; > + return NULL; > If you don't do the above change, the patch will be much simpler. > /* If reserves cannot be used, ensure enough pages are in the pool */ > if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0) > - goto err; > + return NULL; > + Same here. > +retry_cpuset: > + cpuset_mems_cookie = get_mems_allowed(); > + zonelist = huge_zonelist(vma, address, > + htlb_alloc_mask, &mpol, &nodemask); > > for_each_zone_zonelist_nodemask(zone, z, zonelist, > MAX_NR_ZONES - 1, nodemask) { > @@ -572,10 +573,6 @@ retry_cpuset: > if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page)) > goto retry_cpuset; > return page; > - > -err: > - mpol_cond_put(mpol); > - return NULL; > } > > static void update_and_free_page(struct hstate *h, struct page *page) -aneesh
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From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> To: Joonsoo Kim <iamjoonsoo.kim@lge.com>, Andrew Morton <akpm@linux-foundation.org> Cc: Rik van Riel <riel@redhat.com>, Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@suse.cz>, KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>, Hugh Dickins <hughd@google.com>, Davidlohr Bueso <davidlohr.bueso@hp.com>, David Gibson <david@gibson.dropbear.id.au>, linux-mm@kvack.org, linux-kernel@vger.kernel.org, Joonsoo Kim <js1304@gmail.com> Subject: Re: [PATCH 1/9] mm, hugetlb: move up the code which check availability of free huge page Date: Mon, 15 Jul 2013 19:31:33 +0530 [thread overview] Message-ID: <87a9lnkjlu.fsf@linux.vnet.ibm.com> (raw) In-Reply-To: <1373881967-16153-2-git-send-email-iamjoonsoo.kim@lge.com> Joonsoo Kim <iamjoonsoo.kim@lge.com> writes: > We don't need to proceede the processing if we don't have any usable > free huge page. So move this code up. I guess you can also mention that since we are holding hugetlb_lock hstate values can't change. Also. > > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com> > > diff --git a/mm/hugetlb.c b/mm/hugetlb.c > index e2bfbf7..d87f70b 100644 > --- a/mm/hugetlb.c > +++ b/mm/hugetlb.c > @@ -539,10 +539,6 @@ static struct page *dequeue_huge_page_vma(struct hstate *h, > struct zoneref *z; > unsigned int cpuset_mems_cookie; > > -retry_cpuset: > - cpuset_mems_cookie = get_mems_allowed(); > - zonelist = huge_zonelist(vma, address, > - htlb_alloc_mask, &mpol, &nodemask); > /* > * A child process with MAP_PRIVATE mappings created by their parent > * have no page reserves. This check ensures that reservations are > @@ -550,11 +546,16 @@ retry_cpuset: > */ > if (!vma_has_reserves(vma) && > h->free_huge_pages - h->resv_huge_pages == 0) > - goto err; > + return NULL; > If you don't do the above change, the patch will be much simpler. > /* If reserves cannot be used, ensure enough pages are in the pool */ > if (avoid_reserve && h->free_huge_pages - h->resv_huge_pages == 0) > - goto err; > + return NULL; > + Same here. > +retry_cpuset: > + cpuset_mems_cookie = get_mems_allowed(); > + zonelist = huge_zonelist(vma, address, > + htlb_alloc_mask, &mpol, &nodemask); > > for_each_zone_zonelist_nodemask(zone, z, zonelist, > MAX_NR_ZONES - 1, nodemask) { > @@ -572,10 +573,6 @@ retry_cpuset: > if (unlikely(!put_mems_allowed(cpuset_mems_cookie) && !page)) > goto retry_cpuset; > return page; > - > -err: > - mpol_cond_put(mpol); > - return NULL; > } > > static void update_and_free_page(struct hstate *h, struct page *page) -aneesh -- 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:[~2013-07-15 14:01 UTC|newest] Thread overview: 92+ messages / expand[flat|nested] mbox.gz Atom feed top 2013-07-15 9:52 [PATCH 0/9] mm, hugetlb: clean-up and possible bug fix Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 9:52 ` [PATCH 1/9] mm, hugetlb: move up the code which check availability of free huge page Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 14:01 ` Aneesh Kumar K.V [this message] 2013-07-15 14:01 ` Aneesh Kumar K.V 2013-07-16 1:16 ` Joonsoo Kim 2013-07-16 1:16 ` Joonsoo Kim 2013-07-16 3:36 ` Aneesh Kumar K.V 2013-07-16 3:36 ` Aneesh Kumar K.V 2013-07-16 5:10 ` Joonsoo Kim 2013-07-16 5:10 ` Joonsoo Kim 2013-07-22 14:45 ` Michal Hocko 2013-07-22 14:45 ` Michal Hocko 2013-07-15 9:52 ` [PATCH 2/9] mm, hugetlb: trivial commenting fix Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 13:12 ` Hillf Danton 2013-07-15 13:12 ` Hillf Danton 2013-07-15 14:02 ` Aneesh Kumar K.V 2013-07-15 14:02 ` Aneesh Kumar K.V 2013-07-22 14:46 ` Michal Hocko 2013-07-22 14:46 ` Michal Hocko 2013-07-15 9:52 ` [PATCH 3/9] mm, hugetlb: clean-up alloc_huge_page() Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-22 14:51 ` Michal Hocko 2013-07-22 14:51 ` Michal Hocko 2013-07-23 7:29 ` Joonsoo Kim 2013-07-23 7:29 ` Joonsoo Kim 2013-07-15 9:52 ` [PATCH 4/9] mm, hugetlb: fix and clean-up node iteration code to alloc or free Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 14:27 ` Aneesh Kumar K.V 2013-07-15 14:27 ` Aneesh Kumar K.V 2013-07-16 1:41 ` Joonsoo Kim 2013-07-16 1:41 ` Joonsoo Kim 2013-07-17 2:00 ` Jianguo Wu 2013-07-17 2:00 ` Jianguo Wu 2013-07-18 6:46 ` Joonsoo Kim 2013-07-18 6:46 ` Joonsoo Kim 2013-07-15 9:52 ` [PATCH 5/9] mm, hugetlb: remove redundant list_empty check in gather_surplus_pages() Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 14:31 ` Aneesh Kumar K.V 2013-07-15 14:31 ` Aneesh Kumar K.V 2013-07-16 1:42 ` Joonsoo Kim 2013-07-16 1:42 ` Joonsoo Kim 2013-07-22 14:55 ` Michal Hocko 2013-07-22 14:55 ` Michal Hocko 2013-07-15 9:52 ` [PATCH 6/9] mm, hugetlb: do not use a page in page cache for cow optimization Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 13:55 ` Aneesh Kumar K.V 2013-07-15 13:55 ` Aneesh Kumar K.V 2013-07-16 1:56 ` Joonsoo Kim 2013-07-16 1:56 ` Joonsoo Kim 2013-07-17 8:55 ` Wanpeng Li 2013-07-17 8:55 ` Wanpeng Li 2013-07-15 9:52 ` [PATCH 7/9] mm, hugetlb: add VM_NORESERVE check in vma_has_reserves() Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 14:48 ` Aneesh Kumar K.V 2013-07-15 14:48 ` Aneesh Kumar K.V 2013-07-15 15:11 ` Aneesh Kumar K.V 2013-07-15 15:11 ` Aneesh Kumar K.V 2013-07-16 2:12 ` Joonsoo Kim 2013-07-16 2:12 ` Joonsoo Kim 2013-07-16 5:47 ` Aneesh Kumar K.V 2013-07-16 5:47 ` Aneesh Kumar K.V 2013-07-16 7:12 ` Joonsoo Kim 2013-07-16 7:12 ` Joonsoo Kim 2013-07-18 2:03 ` Wanpeng Li 2013-07-18 2:03 ` Wanpeng Li 2013-07-15 9:52 ` [PATCH 8/9] mm, hugetlb: remove decrement_hugepage_resv_vma() Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 14:50 ` Aneesh Kumar K.V 2013-07-15 14:50 ` Aneesh Kumar K.V 2013-07-17 9:31 ` Wanpeng Li 2013-07-17 9:31 ` Wanpeng Li 2013-07-15 9:52 ` [PATCH 9/9] mm, hugetlb: decrement reserve count if VM_NORESERVE alloc page cache Joonsoo Kim 2013-07-15 9:52 ` Joonsoo Kim 2013-07-15 15:11 ` Aneesh Kumar K.V 2013-07-15 15:11 ` Aneesh Kumar K.V 2013-07-18 2:02 ` Wanpeng Li 2013-07-18 2:02 ` Wanpeng Li 2013-07-15 14:10 ` [PATCH 0/9] mm, hugetlb: clean-up and possible bug fix Aneesh Kumar K.V 2013-07-15 14:10 ` Aneesh Kumar K.V 2013-07-16 1:10 ` Joonsoo Kim 2013-07-16 1:10 ` Joonsoo Kim 2013-07-16 1:27 ` Sam Ben 2013-07-16 1:27 ` Sam Ben 2013-07-16 1:45 ` Joonsoo Kim 2013-07-16 1:45 ` Joonsoo Kim 2013-07-16 1:55 ` Sam Ben 2013-07-16 1:55 ` Sam Ben 2013-07-16 2:14 ` Joonsoo Kim 2013-07-16 2:14 ` Joonsoo Kim
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