From: Vlastimil Babka <vbabka-AlSwsSmVLrQ@public.gmane.org>
To: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Cc: Andrew Morton
<akpm-de/tnXTf+JLsfHDXvbKv3WD2FQJk+8+b@public.gmane.org>,
linux-mm-Bw31MaZKKs3YtjvyW6yDsg@public.gmane.org,
linux-api-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
cgroups-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
Li Zefan <lizefan-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>,
Michal Hocko <mhocko-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
Mel Gorman
<mgorman-3eNAlZScCAx27rWaFMvyedHuzzzSOjJt@public.gmane.org>,
David Rientjes <rientjes-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Hugh Dickins <hughd-hpIqsD4AKlfQT0dZR+AlfA@public.gmane.org>,
Andrea Arcangeli
<aarcange-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
Anshuman Khandual
<khandual-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org>,
"Kirill A. Shutemov"
<kirill.shutemov-VuQAYsv1563Yd54FQh9/CA@public.gmane.org>,
Dimitri Sivanich <sivanich-sJ/iWh9BUns@public.gmane.org>
Subject: Re: [PATCH v2 3/6] mm, page_alloc: pass preferred nid instead of zonelist to allocator
Date: Thu, 18 May 2017 12:25:03 +0200 [thread overview]
Message-ID: <c748a22c-9a94-52cb-2247-afc281cc5d78@suse.cz> (raw)
In-Reply-To: <alpine.DEB.2.20.1705171009340.8714-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
On 05/17/2017 05:19 PM, Christoph Lameter wrote:
> On Wed, 17 May 2017, Vlastimil Babka wrote:
>
>> struct page *
>> -__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
>> - struct zonelist *zonelist, nodemask_t *nodemask);
>> +__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
>> + nodemask_t *nodemask);
>>
>> static inline struct page *
>> -__alloc_pages(gfp_t gfp_mask, unsigned int order,
>> - struct zonelist *zonelist)
>> +__alloc_pages(gfp_t gfp_mask, unsigned int order, int preferred_nid)
>> {
>> - return __alloc_pages_nodemask(gfp_mask, order, zonelist, NULL);
>> + return __alloc_pages_nodemask(gfp_mask, order, preferred_nid, NULL);
>> }
>
> Maybe use nid instead of preferred_nid like in __alloc_pages? Otherwise
> there may be confusion with the MPOL_PREFER policy.
I'll think about that.
>> @@ -1963,8 +1960,8 @@ alloc_pages_vma(gfp_t gfp, int order, struct vm_area_struct *vma,
>> {
>> struct mempolicy *pol;
>> struct page *page;
>> + int preferred_nid;
>> unsigned int cpuset_mems_cookie;
>> - struct zonelist *zl;
>> nodemask_t *nmask;
>
> Same here.
>
>> @@ -4012,8 +4012,8 @@ static inline void finalise_ac(gfp_t gfp_mask,
>> * This is the 'heart' of the zoned buddy allocator.
>> */
>> struct page *
>> -__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order,
>> - struct zonelist *zonelist, nodemask_t *nodemask)
>> +__alloc_pages_nodemask(gfp_t gfp_mask, unsigned int order, int preferred_nid,
>> + nodemask_t *nodemask)
>> {
>
> and here
>
> This looks clean to me. Still feel a bit uneasy about this since I do
> remember that we had a reason to use zonelists instead of nodes back then
> but cannot remember what that reason was....
My history digging showed me that mempolicies used to have a custom
zonelist attached, not nodemask. So I supposed that's why.
> CCing Dimitri at SGI. This may break a lot of legacy SGIapps. If you read
> this Dimitri then please review this patchset and the discussions around
> it.
Break how? This shouldn't break any apps AFAICS, just out-of-tree kernel
patches/modules as usual when APIs change.
> Reviewed-by: Christoph Lameter <cl-vYTEC60ixJUAvxtiuMwx3w@public.gmane.org>
Thanks!
next prev parent reply other threads:[~2017-05-18 10:25 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-05-17 8:11 [PATCH v2 0/6] cpuset/mempolicies related fixes and cleanups Vlastimil Babka
2017-05-17 8:11 ` [PATCH v2 1/6] mm, page_alloc: fix more premature OOM due to race with cpuset update Vlastimil Babka
[not found] ` <20170517081140.30654-2-vbabka-AlSwsSmVLrQ@public.gmane.org>
2017-05-19 11:51 ` Michal Hocko
[not found] ` <20170519115110.GB29839-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2017-05-23 11:32 ` Vlastimil Babka
2017-05-17 8:11 ` [PATCH v2 2/6] mm, mempolicy: stop adjusting current->il_next in mpol_rebind_nodemask() Vlastimil Babka
[not found] ` <20170517081140.30654-3-vbabka-AlSwsSmVLrQ@public.gmane.org>
2017-05-17 15:07 ` Christoph Lameter
2017-05-17 8:11 ` [PATCH v2 3/6] mm, page_alloc: pass preferred nid instead of zonelist to allocator Vlastimil Babka
2017-05-17 15:19 ` Christoph Lameter
[not found] ` <alpine.DEB.2.20.1705171009340.8714-wcBtFHqTun5QOdAKl3ChDw@public.gmane.org>
2017-05-18 10:25 ` Vlastimil Babka [this message]
[not found] ` <20170517081140.30654-4-vbabka-AlSwsSmVLrQ@public.gmane.org>
2017-05-19 11:59 ` Michal Hocko
2017-05-17 8:11 ` [PATCH v2 4/6] mm, mempolicy: simplify rebinding mempolicies when updating cpusets Vlastimil Babka
2017-05-23 7:11 ` Michal Hocko
2017-05-17 8:11 ` [PATCH v2 5/6] mm, cpuset: always use seqlock when changing task's nodemask Vlastimil Babka
[not found] ` <20170517081140.30654-6-vbabka-AlSwsSmVLrQ@public.gmane.org>
2017-05-23 7:15 ` Michal Hocko
2017-05-17 8:11 ` [PATCH v2 6/6] mm, mempolicy: don't check cpuset seqlock where it doesn't matter Vlastimil Babka
2017-05-23 7:16 ` Michal Hocko
[not found] ` <20170517081140.30654-1-vbabka-AlSwsSmVLrQ@public.gmane.org>
2017-05-17 16:24 ` [PATCH v2 0/6] cpuset/mempolicies related fixes and cleanups Michal Hocko
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