linux-kernel - Re: [PATCH 1/1] lz4: Implement lz4 with dynamic offset length.

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Date:   Mon, 02 Apr 2018 11:21:52 +0530
From:   Maninder Singh <maninder1.s@...sung.com>
To:     "sergey.senozhatsky.work@...il.com" 
        <sergey.senozhatsky.work@...il.com>
CC:     "herbert@...dor.apana.org.au" <herbert@...dor.apana.org.au>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "minchan@...nel.org" <minchan@...nel.org>,
        "ngupta@...are.org" <ngupta@...are.org>,
        "keescook@...omium.org" <keescook@...omium.org>,
        "anton@...msg.org" <anton@...msg.org>,
        "ccross@...roid.com" <ccross@...roid.com>,
        "tony.luck@...el.com" <tony.luck@...el.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "colin.king@...onical.com" <colin.king@...onical.com>,
        "linux-crypto@...r.kernel.org" <linux-crypto@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        PANKAJ MISHRA <pankaj.m@...sung.com>,
        AMIT SAHRAWAT <a.sahrawat@...sung.com>,
        Vaneet Narang <v.narang@...sung.com>
Subject: Re: [PATCH 1/1] lz4: Implement lz4 with dynamic offset length.

Hi,

>> diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c
>> index 4ed0a78..5bc5aab 100644
>> --- a/drivers/block/zram/zcomp.c
>> +++ b/drivers/block/zram/zcomp.c
>> @@ -17,11 +17,15 @@
>>  #include <linux/crypto.h>
>>  
>>  #include "zcomp.h"
>> +#define KB        (1 << 10)
>>  
>>  static const char * const backends[] = {
>>          "lzo",
>>  #if IS_ENABLED(CONFIG_CRYPTO_LZ4)
>>          "lz4",
>> +#if (PAGE_SIZE < (32 * KB))
>> +        "lz4_dyn",
>> +#endif
> 
>This is not the list of supported algorithms. It's the list of
>recommended algorithms. You can configure zram to use any of
>available and known to Crypto API algorithms. Including lz4_dyn
>on PAGE_SIZE > 32K systems.
> 
>        -ss
 
Yes, we want to integrate new compression(lz4_dyn) for ZRAM 
only if PAGE_SIZE is less than 32KB to get maximum benefit. 
so we added lz4_dyn to available list of ZRAM compression alhorithms.

Thanks,
Manider Singh