From: Sergey Senozhatsky <senozhatsky@chromium.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>,
Minchan Kim <minchan@kernel.org>, Nitin Gupta <ngupta@vflare.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv3 4/8] zram: Introduce recompress sysfs knob
Date: Tue, 18 Oct 2022 11:12:10 +0900 [thread overview]
Message-ID: <Y04LerrIH9KTJM2A@google.com> (raw)
In-Reply-To: <20221017170850.034705ad83c54b92236d14f7@linux-foundation.org>
On (22/10/17 17:08), Andrew Morton wrote:
> > Allow zram to recompress (using secondary compression streams)
> > pages. We support three modes:
> >
> > 1) IDLE pages recompression is activated by `idle` mode
> >
> > echo idle > /sys/block/zram0/recompress
> >
> > 2) Since there may be many idle pages user-space may pass a size
> > watermark value and we will recompress IDLE pages only of equal
> > or greater size:
> >
> > echo 888 > /sys/block/zram0/recompress
>
> It's helpful to describe the units ("bytes") here and in the
> docmentation.
Will send fixup patches.
> > 3) HUGE pages recompression is activated by `huge` mode
> >
> > echo huge > /sys/block/zram0/recompress
> >
> > 4) HUGE_IDLE pages recompression is activated by `huge_idle` mode
> >
> > echo huge_idle > /sys/block/zram0/recompress
> >
> > ...
> >
> > + if (IS_ERR((void *)handle_next)) {
>
> IS_ERR_VALUE() avoids castsing back and forth.
Thanks, I'll send a separate patch for this (if you don't mind).
next prev parent reply other threads:[~2022-10-18 2:12 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-09 9:07 [PATCHv3 0/8] zram: Support multiple compression streams Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 1/8] zram: Preparation for multi-zcomp support Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 2/8] zram: Add recompression algorithm sysfs knob Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 3/8] zram: Factor out WB and non-WB zram read functions Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 4/8] zram: Introduce recompress sysfs knob Sergey Senozhatsky
2022-10-18 0:08 ` Andrew Morton
2022-10-18 2:12 ` Sergey Senozhatsky [this message]
2022-10-18 2:42 ` Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 5/8] documentation: Add recompression documentation Sergey Senozhatsky
2022-10-18 2:22 ` Sergey Senozhatsky
2022-10-18 3:11 ` Andrew Morton
2022-10-18 2:50 ` Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 6/8] zram: Add recompression algorithm choice to Kconfig Sergey Senozhatsky
2022-10-18 3:07 ` Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 7/8] zram: Add recompress flag to read_block_state() Sergey Senozhatsky
2022-10-09 9:07 ` [PATCHv3 8/8] zram: correct typos Sergey Senozhatsky
2022-10-18 0:08 ` Andrew Morton
2022-10-18 2:10 ` Sergey Senozhatsky
2022-10-18 3:11 ` [PATCHv3 0/8] zram: Support multiple compression streams Sergey Senozhatsky
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