Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67;
Date:   Wed, 11 Sep 2019 08:08:38 -0400
From:   "Michael S. Tsirkin" <mst@redhat.com>
To:     Michal Hocko <mhocko@kernel.org>
Cc:     Alexander Duyck <alexander.h.duyck@linux.intel.com>,
        Alexander Duyck <alexander.duyck@gmail.com>,
        virtio-dev@lists.oasis-open.org, kvm list <kvm@vger.kernel.org>,
        Catalin Marinas <catalin.marinas@arm.com>,
        David Hildenbrand <david@redhat.com>,
        Dave Hansen <dave.hansen@intel.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Matthew Wilcox <willy@infradead.org>,
        linux-mm <linux-mm@kvack.org>,
        Andrew Morton <akpm@linux-foundation.org>, will@kernel.org,
        linux-arm-kernel@lists.infradead.org,
        Oscar Salvador <osalvador@suse.de>,
        Yang Zhang <yang.zhang.wz@gmail.com>,
        Pankaj Gupta <pagupta@redhat.com>,
        Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
        Nitesh Narayan Lal <nitesh@redhat.com>,
        Rik van Riel <riel@surriel.com>, lcapitulino@redhat.com,
        "Wang, Wei W" <wei.w.wang@intel.com>,
        Andrea Arcangeli <aarcange@redhat.com>, ying.huang@intel.com,
        Paolo Bonzini <pbonzini@redhat.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Fengguang Wu <fengguang.wu@intel.com>,
        "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [PATCH v9 0/8] stg mail -e --version=v9 \
Message-ID: <20190911080804-mutt-send-email-mst@kernel.org>
References: <20190907172225.10910.34302.stgit@localhost.localdomain>
 <20190910124209.GY2063@dhcp22.suse.cz>
 <CAKgT0Udr6nYQFTRzxLbXk41SiJ-pcT_bmN1j1YR4deCwdTOaUQ@mail.gmail.com>
 <20190910144713.GF2063@dhcp22.suse.cz>
 <CAKgT0UdB4qp3vFGrYEs=FwSXKpBEQ7zo7DV55nJRO2C-KCEOrw@mail.gmail.com>
 <20190910175213.GD4023@dhcp22.suse.cz>
 <1d7de9f9f4074f67c567dbb4cc1497503d739e30.camel@linux.intel.com>
 <20190911113619.GP4023@dhcp22.suse.cz>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20190911113619.GP4023@dhcp22.suse.cz>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Wed, Sep 11, 2019 at 01:36:19PM +0200, Michal Hocko wrote:
> On Tue 10-09-19 14:23:40, Alexander Duyck wrote:
> [...]
> > We don't put any limitations on the allocator other then that it needs to
> > clean up the metadata on allocation, and that it cannot allocate a page
> > that is in the process of being reported since we pulled it from the
> > free_list. If the page is a "Reported" page then it decrements the
> > reported_pages count for the free_area and makes sure the page doesn't
> > exist in the "Boundary" array pointer value, if it does it moves the
> > "Boundary" since it is pulling the page.
> 
> This is still a non-trivial limitation on the page allocation from an
> external code IMHO. I cannot give any explicit reason why an ordering on
> the free list might matter (well except for page shuffling which uses it
> to make physical memory pattern allocation more random) but the
> architecture seems hacky and dubious to be honest. It shoulds like the
> whole interface has been developed around a very particular and single
> purpose optimization.
> 
> I remember that there was an attempt to report free memory that provided
> a callback mechanism [1], which was much less intrusive to the internals
> of the allocator yet it should provide a similar functionality. Did you
> see that approach? How does this compares to it? Or am I completely off
> when comparing them?
> 
> [1] mostly likely not the latest version of the patchset
> http://lkml.kernel.org/r/1502940416-42944-5-git-send-email-wei.w.wang@intel.com
> 
> -- 
> Michal Hocko
> SUSE Labs

Linus nacked that one. He thinks invoking callbacks with lots of
internal mm locks is too fragile.