linux-kernel - Re: [PATCH v3 1/2] mm/vmalloc: add vmalloc_no

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Message-ID: <20210611102330.17701bad@ibm-vm>
Date:   Fri, 11 Jun 2021 10:23:30 +0200
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
        linux-s390@...r.kernel.org, frankja@...ux.ibm.com,
        borntraeger@...ibm.com, cohuck@...hat.com, david@...hat.com,
        linux-mm@...ck.org, Nicholas Piggin <npiggin@...il.com>,
        Uladzislau Rezki <urezki@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Christoph Hellwig <hch@...radead.org>
Subject: Re: [PATCH v3 1/2] mm/vmalloc: add vmalloc_no_huge

On Thu, 10 Jun 2021 14:09:09 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Thu, 10 Jun 2021 17:42:19 +0200 Claudio Imbrenda
> <imbrenda@...ux.ibm.com> wrote:
> 
> > The recent patches to add support for hugepage vmalloc mappings

I will put the proper commit ID here

> > added a flag for __vmalloc_node_range to allow to request small

and the name of the flag here

> > pages. This flag is not accessible when calling vmalloc, the only

and improve the wording in general ("order-0 pages" instead of "small
pages")

> > option is to call directly __vmalloc_node_range, which is not
> > exported.  
> 
> I can find no patch which adds such a flag to __vmalloc_node_range(). 
> I assume you're referring to "mm/vmalloc: switch to bulk allocator in
> __vmalloc_area_node()"?
> 
> Please be quite specific when identifying patches.  More specific than
> "the recent patches"!

sorry!

I was referring to this one: 
121e6f3258fe393e22c36f61a ("mm/vmalloc: hugepage vmalloc mappings")

which introduces the flag VM_NO_HUGE_VMAP

I will reword the commit to be more specific

> Also, it appears from the discussion at
> https://lkml.kernel.org/r/YKUWKFyLdqTYliwu@infradead.org that we'll be
> seeing a new version of "mm/vmalloc: switch to bulk allocator in
> __vmalloc_area_node()".  Would it be better to build these s390 fixes
> into the next version of that patch series rather than as a separate
> followup thing?
>