From: Michal Hocko <mhocko@kernel.org>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Xishi Qiu <qiuxishi@huawei.com>,
zhong jiang <zhongjiang@huawei.com>,
Joonsoo Kim <js1304@gmail.com>,
LKML <linux-kernel@vger.kernel.org>
Subject: Re: [RFC PATCH 4/4] hugetlb: add support for preferred node to alloc_huge_page_nodemask
Date: Mon, 12 Jun 2017 14:20:35 +0200 [thread overview]
Message-ID: <20170612122035.GL7476@dhcp22.suse.cz> (raw)
In-Reply-To: <cb18b8ad-af25-b269-3808-5a7452ee2d60@suse.cz>
On Mon 12-06-17 13:53:51, Vlastimil Babka wrote:
> On 06/12/2017 11:06 AM, Michal Hocko wrote:
[...]
> > -/* Movability of hugepages depends on migration support. */
> > -static inline gfp_t htlb_alloc_mask(struct hstate *h)
> > +static struct page *dequeue_huge_page_node(struct hstate *h, int nid)
> > {
> > - if (hugepages_treat_as_movable || hugepage_migration_supported(h))
> > - return GFP_HIGHUSER_MOVABLE;
> > - else
> > - return GFP_HIGHUSER;
> > + if (nid != NUMA_NO_NODE)
> > + return dequeue_huge_page_node_exact(h, nid);
> > +
> > + return dequeue_huge_page_nodemask(h, nid, NULL);
>
> This with nid == NUMA_NO_NODE will break at node_zonelist(nid,
> gfp_mask); in dequeue_huge_page_nodemask(). I guess just use the local
> node as preferred.
You are right. Anyway I have a patch to remove this helper altogether.
> > -retry_cpuset:
> > - cpuset_mems_cookie = read_mems_allowed_begin();
> > - gfp_mask = htlb_alloc_mask(h);
> > - nid = huge_node(vma, address, gfp_mask, &mpol, &nodemask);
> > - zonelist = node_zonelist(nid, gfp_mask);
> > -
> > - for_each_zone_zonelist_nodemask(zone, z, zonelist,
> > - MAX_NR_ZONES - 1, nodemask) {
> > - if (cpuset_zone_allowed(zone, gfp_mask)) {
> > - page = dequeue_huge_page_node(h, zone_to_nid(zone));
> > - if (page) {
> > - if (avoid_reserve)
> > - break;
> > - if (!vma_has_reserves(vma, chg))
> > - break;
> > -
> > - SetPagePrivate(page);
> > - h->resv_huge_pages--;
> > - break;
> > - }
> > - }
> > + nid = huge_node(vma, address, htlb_alloc_mask(h), &mpol, &nodemask);
> > + page = dequeue_huge_page_nodemask(h, nid, nodemask);
> > + if (page && !(avoid_reserve || (!vma_has_reserves(vma, chg)))) {
>
> Ugh that's hard to parse.
> What about: if (page && !avoid_reserve && vma_has_reserves(...)) ?
Yeah, I have just translated the two breaks into a single condition
without scratching my head to much. If you think that this face of De Morgan
is nicer I can use it.
--
Michal Hocko
SUSE Labs
next prev parent reply other threads:[~2017-06-12 12:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-06-08 7:45 [PATCH 0/4] more sensible hugetlb migration for hotplug/CMA Michal Hocko
2017-06-08 7:45 ` [PATCH 1/4] mm, memory_hotplug: simplify empty node mask handling in new_node_page Michal Hocko
2017-06-08 8:15 ` Vlastimil Babka
2017-06-08 7:45 ` [PATCH 2/4] hugetlb, memory_hotplug: prefer to use reserved pages for migration Michal Hocko
2017-06-08 8:22 ` Vlastimil Babka
2017-06-08 7:45 ` [PATCH 3/4] mm: unify new_node_page and alloc_migrate_target Michal Hocko
2017-06-08 8:36 ` Vlastimil Babka
2017-06-08 8:40 ` Michal Hocko
2017-06-08 7:45 ` [RFC PATCH 4/4] hugetlb: add support for preferred node to alloc_huge_page_nodemask Michal Hocko
2017-06-08 8:38 ` Vlastimil Babka
2017-06-12 9:06 ` Michal Hocko
2017-06-12 11:48 ` Michal Hocko
2017-06-12 11:53 ` Vlastimil Babka
2017-06-12 12:20 ` Michal Hocko [this message]
2017-06-12 15:21 ` Michal Hocko
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