From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
To: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Rik van Riel <riel@redhat.com>,
Johannes Weiner <hannes@cmpxchg.org>,
mgorman@techsingularity.net, Laura Abbott <lauraa@codeaurora.org>,
Minchan Kim <minchan@kernel.org>,
Marek Szyprowski <m.szyprowski@samsung.com>,
Michal Nazarewicz <mina86@mina86.com>,
Vlastimil Babka <vbabka@suse.cz>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v5 1/6] mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE request
Date: Thu, 22 Sep 2016 14:30:03 +0900 [thread overview]
Message-ID: <20160922053003.GA27958@js1304-P5Q-DELUXE> (raw)
In-Reply-To: <87sht0y1rq.fsf@linux.vnet.ibm.com>
On Fri, Sep 16, 2016 at 08:44:17AM +0530, Aneesh Kumar K.V wrote:
> js1304@gmail.com writes:
>
> > From: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> >
> > Freepage on ZONE_HIGHMEM doesn't work for kernel memory so it's not that
> > important to reserve. When ZONE_MOVABLE is used, this problem would
> > theorectically cause to decrease usable memory for GFP_HIGHUSER_MOVABLE
> > allocation request which is mainly used for page cache and anon page
> > allocation. So, fix it.
> >
> > And, defining sysctl_lowmem_reserve_ratio array by MAX_NR_ZONES - 1 size
> > makes code complex. For example, if there is highmem system, following
> > reserve ratio is activated for *NORMAL ZONE* which would be easyily
> > misleading people.
> >
> > #ifdef CONFIG_HIGHMEM
> > 32
> > #endif
> >
> > This patch also fix this situation by defining sysctl_lowmem_reserve_ratio
> > array by MAX_NR_ZONES and place "#ifdef" to right place.
> >
> > Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
> > ---
> > include/linux/mmzone.h | 2 +-
> > mm/page_alloc.c | 7 ++++---
> > 2 files changed, 5 insertions(+), 4 deletions(-)
> >
> > diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
> > index d572b78..e3f39af 100644
> > --- a/include/linux/mmzone.h
> > +++ b/include/linux/mmzone.h
> > @@ -877,7 +877,7 @@ int min_free_kbytes_sysctl_handler(struct ctl_table *, int,
> > void __user *, size_t *, loff_t *);
> > int watermark_scale_factor_sysctl_handler(struct ctl_table *, int,
> > void __user *, size_t *, loff_t *);
> > -extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1];
> > +extern int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES];
> > int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *, int,
> > void __user *, size_t *, loff_t *);
> > int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *, int,
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 4f7d5d7..a8310de 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -198,17 +198,18 @@ static void __free_pages_ok(struct page *page, unsigned int order);
> > * TBD: should special case ZONE_DMA32 machines here - in those we normally
> > * don't need any ZONE_NORMAL reservation
> > */
> > -int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES-1] = {
> > +int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES] = {
> > #ifdef CONFIG_ZONE_DMA
> > 256,
> > #endif
> > #ifdef CONFIG_ZONE_DMA32
> > 256,
> > #endif
> > -#ifdef CONFIG_HIGHMEM
> > 32,
> > +#ifdef CONFIG_HIGHMEM
> > + INT_MAX,
> > #endif
> > - 32,
> > + INT_MAX,
> > };
> >
> > EXPORT_SYMBOL(totalram_pages);
> > --
> > 1.9.1
>
> We can also do things like below to make it readable ?
>
> #ifdef CONFIG_ZONE_DMA
> [ZONE_DMA] = 256,
> #endif
It looks more readable! I will change it.
>
> Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Thanks!
next prev parent reply other threads:[~2016-09-22 5:22 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-08-29 5:07 [PATCH v5 0/6] Introduce ZONE_CMA js1304
2016-08-29 5:07 ` [PATCH v5 1/6] mm/page_alloc: don't reserve ZONE_HIGHMEM for ZONE_MOVABLE request js1304
2016-09-16 3:14 ` Aneesh Kumar K.V
2016-09-22 5:30 ` Joonsoo Kim [this message]
2016-09-21 9:06 ` Vlastimil Babka
2016-08-29 5:07 ` [PATCH v5 2/6] mm/cma: introduce new zone, ZONE_CMA js1304
2016-08-30 10:35 ` Aneesh Kumar K.V
2016-08-30 12:40 ` Aneesh Kumar K.V
2016-08-31 7:58 ` Joonsoo Kim
2016-09-21 9:11 ` Vlastimil Babka
2016-08-29 5:07 ` [PATCH v5 3/6] mm/cma: populate ZONE_CMA js1304
2016-09-21 9:20 ` Vlastimil Babka
2016-09-22 5:45 ` Joonsoo Kim
2016-09-22 6:50 ` Joonsoo Kim
2016-09-22 15:59 ` Vlastimil Babka
2016-09-28 5:34 ` Joonsoo Kim
2016-08-29 5:07 ` [PATCH v5 4/6] mm/cma: remove ALLOC_CMA js1304
2016-08-29 5:07 ` [PATCH v5 5/6] mm/cma: remove MIGRATE_CMA js1304
2016-08-29 5:07 ` [PATCH v5 6/6] mm/cma: remove per zone CMA stat js1304
2016-08-29 9:27 ` [PATCH v5 0/6] Introduce ZONE_CMA Aneesh Kumar K.V
2016-08-30 8:21 ` Joonsoo Kim
2016-08-30 10:39 ` Aneesh Kumar K.V
2016-08-31 8:03 ` Joonsoo Kim
2016-09-01 5:47 ` Aneesh Kumar K.V
2016-09-01 6:01 ` Joonsoo Kim
2016-09-21 14:47 ` Aneesh Kumar K.V
2016-09-22 5:32 ` Joonsoo Kim
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