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Commit a2a12b67 authored by Chao Yu's avatar Chao Yu Committed by Jaegeuk Kim
Browse files

f2fs: export SSR allocation threshold 



This patch exports min_ssr_segments threshold in sysfs to let user
control triggering SSR allocation flexibly.

Signed-off-by: default avatarChao Yu <yuchao0@huawei.com>
Signed-off-by: default avatarJaegeuk Kim <jaegeuk@kernel.org>
parent 0ea80512

Documentation/ABI/testing/sysfs-fs-f2fs

+6 −0
Original line number Diff line number Diff line
@@ -57,6 +57,12 @@ Contact: "Jaegeuk Kim" <jaegeuk@kernel.org> 
Description:

		 Controls the dirty page count condition for redefining hot data.



What:		/sys/fs/f2fs/<disk>/min_ssr_sections

Date:		October 2017

Contact:	"Chao Yu" <yuchao0@huawei.com>

Description:

		 Controls the fee section threshold to trigger SSR allocation.



What:		/sys/fs/f2fs/<disk>/max_small_discards

Date:		November 2013

Contact:	"Jaegeuk Kim" <jaegeuk.kim@samsung.com>

fs/f2fs/f2fs.h

+2 −0
Original line number Diff line number Diff line
@@ -840,6 +840,7 @@ struct f2fs_sm_info { 
	unsigned int min_ipu_util;	/* in-place-update threshold */

	unsigned int min_fsync_blocks;	/* threshold for fsync */

	unsigned int min_hot_blocks;	/* threshold for hot block allocation */

	unsigned int min_ssr_sections;	/* threshold to trigger SSR allocation */



	/* for flush command control */

	struct flush_cmd_control *fcc_info;
@@ -1077,6 +1078,7 @@ struct f2fs_sb_info { 
	int active_logs;			/* # of active logs */

	int dir_level;				/* directory level */

	int inline_xattr_size;			/* inline xattr size */

	unsigned int trigger_ssr_threshold;	/* threshold to trigger ssr */



	block_t user_block_count;		/* # of user blocks */

	block_t total_valid_block_count;	/* # of valid blocks */

fs/f2fs/segment.c

+2 −1
Original line number Diff line number Diff line
@@ -181,7 +181,7 @@ bool need_SSR(struct f2fs_sb_info *sbi) 
		return true;



	return free_sections(sbi) <= (node_secs + 2 * dent_secs + imeta_secs +

						2 * reserved_sections(sbi));

			SM_I(sbi)->min_ssr_sections + reserved_sections(sbi));

}



void register_inmem_page(struct inode *inode, struct page *page)
@@ -3671,6 +3671,7 @@ int build_segment_manager(struct f2fs_sb_info *sbi) 
	sm_info->min_ipu_util = DEF_MIN_IPU_UTIL;

	sm_info->min_fsync_blocks = DEF_MIN_FSYNC_BLOCKS;

	sm_info->min_hot_blocks = DEF_MIN_HOT_BLOCKS;

	sm_info->min_ssr_sections = reserved_sections(sbi);



	sm_info->trim_sections = DEF_BATCHED_TRIM_SECTIONS;

fs/f2fs/sysfs.c

+2 −0
Original line number Diff line number Diff line
@@ -285,6 +285,7 @@ F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, ipu_policy, ipu_policy); 
F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ipu_util, min_ipu_util);

F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_fsync_blocks, min_fsync_blocks);

F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_hot_blocks, min_hot_blocks);

F2FS_RW_ATTR(SM_INFO, f2fs_sm_info, min_ssr_sections, min_ssr_sections);

F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ram_thresh, ram_thresh);

F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, ra_nid_pages, ra_nid_pages);

F2FS_RW_ATTR(NM_INFO, f2fs_nm_info, dirty_nats_ratio, dirty_nats_ratio);
@@ -330,6 +331,7 @@ static struct attribute *f2fs_attrs[] = { 
	ATTR_LIST(min_ipu_util),

	ATTR_LIST(min_fsync_blocks),

	ATTR_LIST(min_hot_blocks),

	ATTR_LIST(min_ssr_sections),

	ATTR_LIST(max_victim_search),

	ATTR_LIST(dir_level),

	ATTR_LIST(ram_thresh),