From: colyli@suse.de
To: linux-bcache@vger.kernel.org
Cc: linux-block@vger.kernel.org, Coly Li <colyli@suse.de>
Subject: [PATCH v3 08/16] bcache: introduce meta_bucket_pages() related helper routines
Date: Wed, 15 Jul 2020 22:30:07 +0800 [thread overview]
Message-ID: <20200715143015.14957-9-colyli@suse.de> (raw)
In-Reply-To: <20200715143015.14957-1-colyli@suse.de>
From: Coly Li <colyli@suse.de>
Currently the in-memory meta data like c->uuids or c->disk_buckets
are allocated by alloc_bucket_pages(). The macro alloc_bucket_pages()
calls __get_free_pages() to allocated continuous pages with order
indicated by ilog2(bucket_pages(c)),
#define alloc_bucket_pages(gfp, c) \
((void *) __get_free_pages(__GFP_ZERO|gfp, ilog2(bucket_pages(c))))
The maximum order is defined as MAX_ORDER, the default value is 11 (and
can be overwritten by CONFIG_FORCE_MAX_ZONEORDER). In bcache code the
maximum bucket size width is 16bits, this is restricted both by KEY_SIZE
size and bucket_size size from struct cache_sb_disk. The maximum 16bits
width and power-of-2 value is (1<<15) in unit of sector (512byte). It
means the maximum value of bucket size in bytes is (1<<24) bytes a.k.a
4096 pages.
When the bucket size is set to maximum permitted value, ilog2(4096) is
12, which exceeds the default maximum order __get_free_pages() can
accepted, the failed pages allocation will fail cache set registration
procedure and print a kernel oops message for the exceeded pages order.
This patch introduces meta_bucket_pages(), meta_bucket_bytes(), and
alloc_bucket_pages() helper routines. meta_bucket_pages() indicates the
maximum pages can be allocated to meta data bucket, meta_bucket_bytes()
indicates the according maximum bytes, and alloc_bucket_pages() does
the pages allocation for meta bucket. Because meta_bucket_pages()
chooses the smaller value among the bucket size and MAX_ORDER_NR_PAGES,
it still works when MAX_ORDER overwritten by CONFIG_FORCE_MAX_ZONEORDER.
Following patches will use these helper routines to decide maximum pages
can be allocated for different meta data buckets. If the bucket size is
larger than meta_bucket_bytes(), the bcache registration can continue to
success, just the space more than meta_bucket_bytes() inside the bucket
is wasted. Comparing bcache failed for large bucket size, wasting some
space for meta data buckets is acceptable at this moment.
Signed-off-by: Coly Li <colyli@suse.de>
---
drivers/md/bcache/bcache.h | 20 ++++++++++++++++++++
drivers/md/bcache/super.c | 3 +++
2 files changed, 23 insertions(+)
diff --git a/drivers/md/bcache/bcache.h b/drivers/md/bcache/bcache.h
index 80e3c4813fb0..972f1aff0f70 100644
--- a/drivers/md/bcache/bcache.h
+++ b/drivers/md/bcache/bcache.h
@@ -762,6 +762,26 @@ struct bbio {
#define bucket_bytes(c) ((c)->sb.bucket_size << 9)
#define block_bytes(c) ((c)->sb.block_size << 9)
+static inline unsigned int meta_bucket_pages(struct cache_sb *sb)
+{
+ unsigned int n, max_pages;
+
+ max_pages = min_t(unsigned int,
+ __rounddown_pow_of_two(USHRT_MAX) / PAGE_SECTORS,
+ MAX_ORDER_NR_PAGES);
+
+ n = sb->bucket_size / PAGE_SECTORS;
+ if (n > max_pages)
+ n = max_pages;
+
+ return n;
+}
+
+static inline unsigned int meta_bucket_bytes(struct cache_sb *sb)
+{
+ return meta_bucket_pages(sb) << PAGE_SHIFT;
+}
+
#define prios_per_bucket(c) \
((bucket_bytes(c) - sizeof(struct prio_set)) / \
sizeof(struct bucket_disk))
diff --git a/drivers/md/bcache/super.c b/drivers/md/bcache/super.c
index e8a505ef766d..4baec6ac55c8 100644
--- a/drivers/md/bcache/super.c
+++ b/drivers/md/bcache/super.c
@@ -1821,6 +1821,9 @@ void bch_cache_set_unregister(struct cache_set *c)
#define alloc_bucket_pages(gfp, c) \
((void *) __get_free_pages(__GFP_ZERO|__GFP_COMP|gfp, ilog2(bucket_pages(c))))
+#define alloc_meta_bucket_pages(gfp, sb) \
+ ((void *) __get_free_pages(__GFP_ZERO|__GFP_COMP|gfp, ilog2(meta_bucket_pages(sb))))
+
struct cache_set *bch_cache_set_alloc(struct cache_sb *sb)
{
int iter_size;
--
2.26.2
next prev parent reply other threads:[~2020-07-15 14:30 UTC|newest]
Thread overview: 33+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-07-15 14:29 [PATCH v3 00/16] bcache: extend bucket size to 32bit width colyli
2020-07-15 14:30 ` [PATCH v3 01/16] bcache: add read_super_common() to read major part of super block colyli
2020-07-15 14:30 ` [PATCH v3 02/16] bcache: add more accurate error information in read_super_common() colyli
2020-07-15 14:30 ` [PATCH v3 03/16] bcache: disassemble the big if() checks in bch_cache_set_alloc() colyli
2020-07-15 14:30 ` [PATCH v3 04/16] bcache: fix super block seq numbers comparision in register_cache_set() colyli
2020-07-15 14:30 ` [PATCH v3 05/16] bcache: increase super block version for cache device and backing device colyli
2020-07-15 14:30 ` [PATCH v3 06/16] bcache: move bucket related code into read_super_common() colyli
2020-07-15 14:30 ` [PATCH v3 07/16] bcache: struct cache_sb is only for in-memory super block now colyli
2020-07-15 18:21 ` Christoph Hellwig
2020-07-16 3:31 ` Coly Li
2020-07-15 14:30 ` colyli [this message]
2020-07-15 15:36 ` [PATCH v3 08/16] bcache: introduce meta_bucket_pages() related helper routines Hannes Reinecke
2020-07-15 16:00 ` Coly Li
2020-07-15 14:30 ` [PATCH v3 09/16] bcache: handle c->uuids properly for bucket size > 8MB colyli
2020-07-15 15:37 ` Hannes Reinecke
2020-07-15 14:30 ` [PATCH v3 10/16] bcache: handle cache prio_buckets and disk_buckets " colyli
2020-07-15 15:38 ` Hannes Reinecke
2020-07-15 14:30 ` [PATCH v3 11/16] bcache: handle cache set verify_ondisk " colyli
2020-07-16 6:07 ` Hannes Reinecke
2020-07-15 14:30 ` [PATCH v3 12/16] bcache: handle btree node memory allocation " colyli
2020-07-16 6:08 ` Hannes Reinecke
2020-07-15 14:30 ` [PATCH v3 13/16] bcache: add bucket_size_hi into struct cache_sb_disk for large bucket colyli
2020-07-16 6:15 ` Hannes Reinecke
2020-07-16 6:41 ` Coly Li
2020-07-16 7:02 ` Hannes Reinecke
2020-07-16 7:08 ` Coly Li
2020-07-15 14:30 ` [PATCH v3 14/16] bcache: add sysfs file to display feature sets information of cache set colyli
2020-07-16 6:17 ` Hannes Reinecke
2020-07-16 6:20 ` Coly Li
2020-07-15 14:30 ` [PATCH v3 15/16] bcache: avoid extra memory allocation from mempool c->fill_iter colyli
2020-07-16 6:18 ` Hannes Reinecke
2020-07-15 14:30 ` [PATCH v3 16/16] bcache: avoid extra memory consumption in struct bbio for large bucket size colyli
2020-07-16 6:18 ` Hannes Reinecke
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