linux-kernel - Re: [PATCH RFC 01/10] vmalloc: Add basic perm alloc implementation

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Date:   Tue, 24 Nov 2020 20:00:03 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "hch@...radead.org" <hch@...radead.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "daniel@...earbox.net" <daniel@...earbox.net>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "jeyu@...nel.org" <jeyu@...nel.org>,
        "bpf@...r.kernel.org" <bpf@...r.kernel.org>,
        "rppt@...nel.org" <rppt@...nel.org>,
        "ast@...nel.org" <ast@...nel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "dave.hansen@...ux.intel.com" <dave.hansen@...ux.intel.com>,
        "Weiny, Ira" <ira.weiny@...el.com>,
        "x86@...nel.org" <x86@...nel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "Reshetova, Elena" <elena.reshetova@...el.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "luto@...nel.org" <luto@...nel.org>
Subject: Re: [PATCH RFC 01/10] vmalloc: Add basic perm alloc implementation

On Tue, 2020-11-24 at 10:16 +0000, Christoph Hellwig wrote:
> On Mon, Nov 23, 2020 at 12:01:35AM +0000, Edgecombe, Rick P wrote:
> > Another option could be putting the new metadata in vm_struct and
> > just
> > return that, like get_vm_area(). Then we don't need to invent a new
> > struct. But then normal vmalloc()'s would have a bit of wasted
> > memory
> > since they don't need this metadata.
> 
> That would seem most natural to me.  We'll need to figure out how we
> can do that without bloating vm_struct too much.  One option would
> be a bigger structure that embedds vm_struct and can be retreived
> using
> container_of().

Hmm, neat. I can change this in the next version.