Hi Lee,
> -Original Message-
> From: 이창만 [mailto:cm224@samsung.com]
> Sent: Monday, October 28, 2013 10:20 AM
> To: 'Chao Yu'; jaegeuk@samsung.com
> Cc: linux-fsde...@vger.kernel.org; '谭姝'; linux-kernel@vger.kernel.org;
> linux-f2fs-de...@lists.sourceforge.net
> Subject: RE:
Hi Lee,
-Original Message-
From: 이창만 [mailto:cm224@samsung.com]
Sent: Monday, October 28, 2013 10:20 AM
To: 'Chao Yu'; jaegeuk@samsung.com
Cc: linux-fsde...@vger.kernel.org; '谭姝'; linux-kernel@vger.kernel.org;
linux-f2fs-de...@lists.sourceforge.net
Subject: RE: [f2fs-dev]
On 10/28/2013 10:19 AM, 이창만 wrote:
> To check whether bitmap are all zeros or all ones, I think memcmp is more
> neat.
> But I don't know exactly performance gap between memcmp and find_next_bit.
According to my understanding,
memcmp: one by one search,
find_next_bit: binary search.
Regards,
To check whether bitmap are all zeros or all ones, I think memcmp is more neat.
But I don't know exactly performance gap between memcmp and find_next_bit.
-Original Message-
From: Chao Yu [mailto:chao2...@samsung.com]
Sent: Thursday, October 24, 2013 5:21 PM
To: jaegeuk@samsung.com
To check whether bitmap are all zeros or all ones, I think memcmp is more neat.
But I don't know exactly performance gap between memcmp and find_next_bit.
-Original Message-
From: Chao Yu [mailto:chao2...@samsung.com]
Sent: Thursday, October 24, 2013 5:21 PM
To: jaegeuk@samsung.com
On 10/28/2013 10:19 AM, 이창만 wrote:
To check whether bitmap are all zeros or all ones, I think memcmp is more
neat.
But I don't know exactly performance gap between memcmp and find_next_bit.
According to my understanding,
memcmp: one by one search,
find_next_bit: binary search.
Regards,
Gu
Hi Gu,
> -Original Message-
> From: Gu Zheng [mailto:guz.f...@cn.fujitsu.com]
> Sent: Thursday, October 24, 2013 6:04 PM
> To: Chao Yu
> Cc: jaegeuk@samsung.com; linux-fsde...@vger.kernel.org;
> linux-kernel@vger.kernel.org; linux-f2fs-de...@lists.sourceforge.net; '谭姝'
> Subject: Re:
Hi Yu,
On 10/24/2013 04:21 PM, Chao Yu wrote:
> Previously, check_block_count check valid_map with bit data type in common
> scenario that sit has all ones or zeros bitmap, it makes low mount
> performance.
> So let's check the special bitmap with integer data type instead of the bit
> one.
>
Hi Yu,
On 10/24/2013 04:21 PM, Chao Yu wrote:
Previously, check_block_count check valid_map with bit data type in common
scenario that sit has all ones or zeros bitmap, it makes low mount
performance.
So let's check the special bitmap with integer data type instead of the bit
one.
v2:
Hi Gu,
-Original Message-
From: Gu Zheng [mailto:guz.f...@cn.fujitsu.com]
Sent: Thursday, October 24, 2013 6:04 PM
To: Chao Yu
Cc: jaegeuk@samsung.com; linux-fsde...@vger.kernel.org;
linux-kernel@vger.kernel.org; linux-f2fs-de...@lists.sourceforge.net; '谭姝'
Subject: Re:
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