From: Suren Baghdasaryan <surenb@google.com>
To: Kent Overstreet <kent.overstreet@linux.dev>
Cc: Matthew Wilcox <willy@infradead.org>,
John Hubbard <jhubbard@nvidia.com>,
Andrew Morton <akpm@linux-foundation.org>,
corbet@lwn.net, arnd@arndb.de, mcgrof@kernel.org,
rppt@kernel.org, paulmck@kernel.org, thuth@redhat.com,
tglx@linutronix.de, bp@alien8.de, xiongwei.song@windriver.com,
ardb@kernel.org, david@redhat.com, vbabka@suse.cz,
mhocko@suse.com, hannes@cmpxchg.org, roman.gushchin@linux.dev,
dave@stgolabs.net, liam.howlett@oracle.com,
pasha.tatashin@soleen.com, souravpanda@google.com,
keescook@chromium.org, dennis@kernel.org, yuzhao@google.com,
vvvvvv@google.com, rostedt@goodmis.org, iamjoonsoo.kim@lge.com,
rientjes@google.com, minchan@google.com, kaleshsingh@google.com,
linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
linux-arch@vger.kernel.org, linux-mm@kvack.org,
linux-modules@vger.kernel.org, kernel-team@android.com
Subject: Re: [PATCH v2 6/6] alloc_tag: config to store page allocation tag refs in page flags
Date: Wed, 4 Sep 2024 09:39:33 -0700 [thread overview]
Message-ID: <CAJuCfpEtsWM2S0K=UB1QZ81qeq_5jY-R0zNz3Kc8WojvJfj76w@mail.gmail.com> (raw)
In-Reply-To: <keaqrfkkoswtpbtvr3l5oetd4d3ncbpaxsay7dckn74qdob2u2@lohq26fuccib>
On Wed, Sep 4, 2024 at 9:37 AM Kent Overstreet
<kent.overstreet@linux.dev> wrote:
>
> On Wed, Sep 04, 2024 at 05:35:49PM GMT, Matthew Wilcox wrote:
> > On Wed, Sep 04, 2024 at 09:18:01AM -0700, Suren Baghdasaryan wrote:
> > > I'm not sure I understand your suggestion, Matthew. We allocate a
> > > folio and need to store a reference to the tag associated with the
> > > code that allocated that folio. We are not operating with ranges here.
> > > Are you suggesting to use a maple tree instead of page_ext to store
> > > this reference?
> >
> > I'm saying that a folio has a physical address. So you can use a physical
> > address as an index into a maple tree to store additional information
> > instead of using page_ext or trying to hammer the additional information
> > into struct page somewhere.
>
> Ah, thanks, that makes more sense.
>
> But it would add a lot of overhead to the page alloc/free paths...
Yeah, inserting into a maple_tree in the fast path of page allocation
would introduce considerable performance overhead.
next prev parent reply other threads:[~2024-09-04 16:39 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-02 4:41 [PATCH v2 0/6] page allocation tag compression Suren Baghdasaryan
2024-09-02 4:41 ` [PATCH v2 1/6] maple_tree: add mas_for_each_rev() helper Suren Baghdasaryan
2024-09-02 4:41 ` [PATCH v2 2/6] alloc_tag: load module tags into separate continuous memory Suren Baghdasaryan
2024-09-02 4:41 ` [PATCH v2 3/6] alloc_tag: eliminate alloc_tag_ref_set Suren Baghdasaryan
2024-09-02 4:41 ` [PATCH v2 4/6] alloc_tag: introduce pgalloc_tag_ref to abstract page tag references Suren Baghdasaryan
2024-09-02 4:41 ` [PATCH v2 5/6] alloc_tag: make page allocation tag reference size configurable Suren Baghdasaryan
2024-09-02 5:09 ` Andrew Morton
2024-09-04 1:07 ` Suren Baghdasaryan
2024-09-04 1:16 ` Kent Overstreet
2024-09-04 2:04 ` Suren Baghdasaryan
2024-09-04 16:25 ` Kent Overstreet
2024-09-04 16:35 ` Suren Baghdasaryan
2024-09-02 4:41 ` [PATCH v2 6/6] alloc_tag: config to store page allocation tag refs in page flags Suren Baghdasaryan
2024-09-02 5:16 ` Andrew Morton
2024-09-03 18:19 ` Suren Baghdasaryan
2024-09-04 1:25 ` John Hubbard
2024-09-04 2:05 ` John Hubbard
2024-09-04 16:08 ` Suren Baghdasaryan
2024-09-04 18:58 ` John Hubbard
2024-09-04 21:07 ` Suren Baghdasaryan
2024-09-04 2:18 ` Matthew Wilcox
2024-09-04 16:18 ` Suren Baghdasaryan
2024-09-04 16:21 ` Kent Overstreet
2024-09-04 16:35 ` Matthew Wilcox
2024-09-04 16:37 ` Kent Overstreet
2024-09-04 16:39 ` Suren Baghdasaryan [this message]
2024-09-04 2:41 ` Kent Overstreet
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