From: Minchan Kim <minchan@kernel.org>
To: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Nitin Gupta <ngupta@vflare.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCHv4 8/9] Documentation: document zram pages_per_pool_page attribute
Date: Thu, 10 Nov 2022 18:20:56 -0800 [thread overview]
Message-ID: <Y22xiLFYb49TGeYm@google.com> (raw)
In-Reply-To: <20221031054108.541190-9-senozhatsky@chromium.org>
On Mon, Oct 31, 2022 at 02:41:07PM +0900, Sergey Senozhatsky wrote:
> Provide a simple documentation for pages_per_pool_page ZRAM
> device attribute.
>
> Signed-off-by: Sergey Senozhatsky <senozhatsky@chromium.org>
> ---
> Documentation/admin-guide/blockdev/zram.rst | 38 ++++++++++++++++-----
> 1 file changed, 30 insertions(+), 8 deletions(-)
>
> diff --git a/Documentation/admin-guide/blockdev/zram.rst b/Documentation/admin-guide/blockdev/zram.rst
> index 010fb05a5999..4cb287520d45 100644
> --- a/Documentation/admin-guide/blockdev/zram.rst
> +++ b/Documentation/admin-guide/blockdev/zram.rst
> @@ -112,7 +112,29 @@ to list all of them using, for instance, /proc/crypto or any other
> method. This, however, has an advantage of permitting the usage of
> custom crypto compression modules (implementing S/W or H/W compression).
>
> -4) Set Disksize
> +4) Set pages per-pool page limit: Optional
> +==========================================
> +
> +zsmalloc pages can consist of up to ZS_DEFAULT_PAGES_PER_ZSPAGE (single)
> +physical pages. The exact number is calculated for each zsmalloc size
> +class during zsmalloc pool creation. ZRAM provides pages_per_pool_page
> +device attribute that lets one adjust that limit (maximum possible value
> +is ZS_MAX_PAGES_PER_ZSPAGE). The default limit is considered to be good
> +enough, so tweak this value only when the changes in zsmalloc size classes
> +characteristics are beneficial for your data patterns. The limit on the
> +pages per zspages (currently) should be in [1,16] range; default value
> +is 4.
I think we need to introudce pros and cons for user to decide it since
it's not familiar with admin. I think It would need more explanation about
zsmalloc internal(especailly zspage and size classes)
next prev parent reply other threads:[~2022-11-11 2:21 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-31 5:40 [PATCHv4 0/9] zsmalloc/zram: configurable zspage size Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 1/9] zram: add size class equals check into recompression Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 2/9] zsmalloc: turn zspage order into runtime variable Sergey Senozhatsky
2022-11-10 21:59 ` Minchan Kim
2022-11-11 10:38 ` Sergey Senozhatsky
2022-11-11 17:09 ` Minchan Kim
2022-11-14 3:55 ` Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 3/9] zsmalloc: move away from page order defines Sergey Senozhatsky
2022-11-10 22:02 ` Minchan Kim
2022-10-31 5:41 ` [PATCHv4 4/9] zsmalloc: make huge class watermark zs_pool member Sergey Senozhatsky
2022-11-10 22:25 ` Minchan Kim
2022-11-11 1:07 ` Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 5/9] zram: huge size watermark cannot be global Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 6/9] zsmalloc: pass limit on pages per-zspage to zs_create_pool() Sergey Senozhatsky
2022-11-09 6:24 ` Sergey Senozhatsky
2022-11-11 17:14 ` Minchan Kim
2022-11-11 2:10 ` Minchan Kim
2022-11-11 10:32 ` Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 7/9] zram: add pages_per_pool_page device attribute Sergey Senozhatsky
2022-11-09 4:34 ` Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 8/9] Documentation: document zram pages_per_pool_page attribute Sergey Senozhatsky
2022-11-11 2:20 ` Minchan Kim [this message]
2022-11-11 10:34 ` Sergey Senozhatsky
2022-10-31 5:41 ` [PATCHv4 9/9] zsmalloc: break out of loop when found perfect zspage order Sergey Senozhatsky
2022-11-10 22:44 ` [PATCHv4 0/9] zsmalloc/zram: configurable zspage size Minchan Kim
2022-11-11 0:56 ` Sergey Senozhatsky
2022-11-11 17:03 ` Minchan Kim
2022-11-14 3:53 ` Sergey Senozhatsky
2022-11-14 7:55 ` Sergey Senozhatsky
2022-11-14 8:37 ` Sergey Senozhatsky
2022-11-15 6:01 ` Sergey Senozhatsky
2022-11-15 7:59 ` Sergey Senozhatsky
2022-11-15 23:23 ` Minchan Kim
2022-11-16 0:52 ` Sergey Senozhatsky
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