From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Herbert Xu <herbert@gondor.apana.org.au>
Cc: Yosry Ahmed <yosry.ahmed@linux.dev>,
Sergey Senozhatsky <senozhatsky@chromium.org>,
Andrew Morton <akpm@linux-foundation.org>,
Nhat Pham <nphamcs@gmail.com>, Minchan Kim <minchan@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Brian Geffon <bgeffon@google.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [RFC PATCH 2/2] zsmalloc: chain-length configuration should consider other metrics
Date: Mon, 12 Jan 2026 14:07:24 +0900 [thread overview]
Message-ID: <xjykydutkvth5k6vqbxhv4tozudw44dipqphnotpkrolx65wka@ugubqmsfu2ln> (raw)
In-Reply-To: <aWSAF4s7SYjWP9mq@gondor.apana.org.au>
On (26/01/12 13:01), Herbert Xu wrote:
> On Fri, Jan 09, 2026 at 04:02:51PM +0000, Yosry Ahmed wrote:
> >
> > Herbert, do you mind taking a look at this? It looks sane to me except
> > for one question below.
>
> Looks alright to me too.
>
> > > + size_t sizes[2];
> > > +
> > > + /* this object spans two pages */
> > > + sizes[0] = PAGE_SIZE - off;
> > > + sizes[1] = mem_len - sizes[0];
> > > +
> > > + sg_init_table(sg, 2);
> > > + sg_set_page(sg, zpdesc_page(zpdesc), sizes[0], off);
> > > +
> > > + zpdesc = get_next_zpdesc(zpdesc);
> > > + sg = sg_next(sg);
> >
> > Is this stateful? Will the SG list be returned pointing at the second
> > page now?
>
> It makes no difference because we just called sg_init_table(sg, 2),
> so sg_next(sg) is equivalent to &sg[1].
I did it this way for (sort of) consistency: sg next follows zpdesc next.
next prev parent reply other threads:[~2026-01-12 5:07 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-01 1:38 [RFC PATCH 0/2] zsmalloc: size-classes chain-length tunings Sergey Senozhatsky
2026-01-01 1:38 ` [RFC PATCH 1/2] zsmalloc: drop hard limit on the number of size classes Sergey Senozhatsky
2026-01-01 1:38 ` [RFC PATCH 2/2] zsmalloc: chain-length configuration should consider other metrics Sergey Senozhatsky
2026-01-02 18:29 ` Yosry Ahmed
2026-01-05 1:42 ` Sergey Senozhatsky
2026-01-05 7:23 ` Sergey Senozhatsky
2026-01-05 16:01 ` Yosry Ahmed
2026-01-06 4:10 ` Sergey Senozhatsky
2026-01-05 15:58 ` Yosry Ahmed
2026-01-06 4:20 ` Sergey Senozhatsky
2026-01-06 4:22 ` Sergey Senozhatsky
2026-01-06 5:08 ` Herbert Xu
2026-01-06 16:24 ` Yosry Ahmed
2026-01-07 5:25 ` Herbert Xu
2026-01-07 5:39 ` Yosry Ahmed
2026-01-07 5:42 ` Herbert Xu
2026-01-07 5:43 ` Sergey Senozhatsky
2026-01-07 17:12 ` Yosry Ahmed
2026-01-08 7:37 ` Sergey Senozhatsky
2026-01-08 8:01 ` Yosry Ahmed
2026-01-08 8:05 ` Herbert Xu
2026-01-09 3:29 ` Sergey Senozhatsky
2026-01-09 16:02 ` Yosry Ahmed
2026-01-12 5:01 ` Herbert Xu
2026-01-12 5:07 ` Sergey Senozhatsky [this message]
2026-01-06 9:47 ` Sergey Senozhatsky
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