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[6.12] Track btrfs patches #36

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[6.12] Track btrfs patches #36

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5e49c78
btrfs: add flags to give an hint to the chunk allocator
kreijack Oct 24, 2021
160344a
btrfs: export dev_item.type in /sys/fs/btrfs/<uuid>/devinfo/<devid>/type
kreijack Oct 24, 2021
29637f2
btrfs: change the DEV_ITEM 'type' field via sysfs
kreijack Oct 24, 2021
970b99e
btrfs: add allocator_hint mode
kreijack Oct 24, 2021
1c1f2e2
btrfs: add allocator_hint for no allocation preferred
kakra Jun 27, 2024
82553ef
btrfs: add allocator_hint to disable allocation completely
kakra Dec 5, 2024
10248db
btrfs: simplify output formatting in btrfs_read_policy_show
asj Jan 1, 2025
4a49a27
btrfs: initialize fs_devices->fs_info earlier
asj Jan 1, 2025
ccb2922
btrfs: add btrfs_read_policy_to_enum helper and refactor read policy …
asj Jan 1, 2025
cf73e90
btrfs: add tracking of read blocks for read policy
asj Jan 1, 2025
7070070
btrfs: introduce CONFIG_BTRFS_EXPERIMENTAL from 6.13
kakra Sep 16, 2024
3efa6c7
btrfs: handle value associated with read policy parameter
asj Jan 1, 2025
6f1b9b1
btrfs: introduce RAID1 round-robin read balancing
kakra May 2, 2025
6fcee9b
btrfs: add RAID1 preferred read device
asj Jan 1, 2025
b627950
btrfs: expose experimental mode in module information
asj Jan 1, 2025
108c5e8
btrfs: enable read policy configuration via modprobe parameter
asj Jan 1, 2025
b2c5980
btrfs: modload to print read policy status
asj Jan 1, 2025
65b747f
btrfs: use the path with the lowest latency for RAID1 reads
asj Oct 11, 2024
a6dfeed
btrfs: move latency-based selection into helper
kakra Apr 9, 2025
c9b6612
btrfs: fix btrfs_read_rr to use the actual number of stripes
kakra Apr 9, 2025
5aa9fb5
btrfs: create a helper instead of open coding device latency calculation
kakra Apr 15, 2025
a451102
btrfs: add filtering by latency to btrfs_read_rr
kakra Apr 14, 2025
9e88f8e
btrfs: add hybrid latency-rr read policy
kakra Apr 18, 2025
eee7666
btrfs: add devinfo read stats to sysfs
kakra Apr 16, 2025
7437625
btrfs: add last IO age to sysfs read_stats
kakra Apr 16, 2025
7c776c2
btrfs: probe read latency if device is 1000 IOs behind its siblings
kakra Apr 16, 2025
fbeb5da
btrfs: allow a short burst of IO for probing read latency
kakra Apr 17, 2025
919eaf1
btrfs: use checkpoint latency instead of cumulative latency
kakra Apr 20, 2025
6f8dc12
btrfs: stat latency checkpoints to get more insight
kakra Apr 20, 2025
18c0ef0
btrfs: rename thresholds to better match with the checkpoint logic
kakra Apr 20, 2025
f4f2455
btrfs: add a stripe ignored counter
kakra Apr 20, 2025
db46d71
btrfs: tune age and burst for latency checkpoint
kakra Apr 21, 2025
504aea7
btrfs: add in-flight queue read policy
kakra Apr 25, 2025
e905c0c
btrfs: guard access to bdev in latency stats and inflight calculation
kakra Apr 27, 2025
740955e
btrfs: reduce atomic reads where possible in btrfs_device_read_latency
kakra May 1, 2025
abf6174
TEST: btrfs: btrfs_backref_resched.patch
fdmanana Jun 23, 2025
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btrfs: move latency-based selection into helper 
Signed-off-by: Kai Krakow <[email protected]>
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@kakra
kakra committed May 2, 2025
commit a6dfeede73e04a27f7e023d3f2f06765c37e968b
42 changes: 32 additions & 10 deletions fs/btrfs/volumes.c
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Original file line number Diff line number Diff line change
Expand Up @@ -6007,15 +6007,26 @@ static int btrfs_read_preferred(struct btrfs_chunk_map *map, int first,
return first;
}

static int btrfs_best_stripe(struct btrfs_fs_info *fs_info,
struct btrfs_chunk_map *map, int first,
int num_stripe)
/*
* btrfs_best_stripe
*
* Select a stripe for reading using the average latency:
*
* 1. Compute the average latency of the device by dividing total latency
* by number of IOs.
* 2. Store minimum latency and selected stripe in best_wait / best_stripe.
*
* Will always find at least one stripe.
*/
static void btrfs_best_stripe(struct btrfs_fs_info *fs_info,
struct btrfs_chunk_map *map, int first,
int num_stripes, u64 *best_wait, int *best_stripe)
{
u64 best_wait = U64_MAX;
int best_stripe = 0;
int index;
*best_wait = U64_MAX;
*best_stripe = 0;

for (index = first; index < first + num_stripe; index++) {
for (index = first; index < first + num_stripes; index++) {
u64 read_wait;
u64 avg_wait = 0;
unsigned long read_ios;
Expand All @@ -6027,11 +6038,22 @@ static int btrfs_best_stripe(struct btrfs_fs_info *fs_info,
if (read_wait && read_ios && read_wait >= read_ios)
avg_wait = div_u64(read_wait, read_ios);

if (best_wait > avg_wait) {
best_wait = avg_wait;
best_stripe = index;
if (*best_wait > avg_wait) {
*best_wait = avg_wait;
*best_stripe = index;
}
}
}

static int btrfs_read_fastest(struct btrfs_fs_info *fs_info,
struct btrfs_chunk_map *map, int first,
int num_stripes)
{
u64 best_wait;
int best_stripe;

btrfs_best_stripe(fs_info, map, first, num_stripes, &best_wait,
&best_stripe);

return best_stripe;
}
Expand Down Expand Up @@ -6131,7 +6153,7 @@ static int find_live_mirror(struct btrfs_fs_info *fs_info,
preferred_mirror = btrfs_read_preferred(map, first, num_stripes);
break;
case BTRFS_READ_POLICY_LATENCY:
preferred_mirror = btrfs_best_stripe(fs_info, map, first,
preferred_mirror = btrfs_read_fastest(fs_info, map, first,
num_stripes);
break;
#endif
Expand Down