mirrors/scoutfs
1
0
Fork 0
mirror of https://github.com/versity/scoutfs.git synced 2026-07-23 16:43:17 +00:00
Code Issues Packages Projects Releases Wiki Activity
Files
05371b83f025801fe6bde35eb4e72abb5f8f1b8f
scoutfs/kmod/src/counters.h
T
Zach Brown acafb869e7 Avoid deadlock from block reclaim in rht resize 
The RCU hash table uses deferred work to resize the hash table.  There's
a time during resize when hash table iteration will return EAGAIN until
resize makes more progress.  During this time resize can perform
GFP_KERNEL allocations.

Our shrinker tries to iterate over its RCU hash table to find blocks to
reclaim.  It tries to restart iteration if it gets EAGAIN on the
assumption that it will be usable again soon.

Combine the two and our shrinker can get stuck retrying iteration
indefinitely because it's shrinking on behalf of the hash table resizing
that is trying to allocate the next table before making iteration work
again.  We have to stop shrinking in this case so that the resizing
caller can proceed.

Signed-off-by: Zach Brown <zab@versity.com>
2023-06-15 14:45:26 -07:00

247 lines
9.1 KiB
C
Raw Blame History

#ifndef _SCOUTFS_COUNTERS_H_
#define _SCOUTFS_COUNTERS_H_
#include <linux/kobject.h>
#include <linux/completion.h>
#include <linux/percpu_counter.h>
#include "super.h"
/*
* We only have to define each counter here and it'll be enumerated in
* other places by this macro. Don't forget to update LAST_COUNTER.
*/
#define EXPAND_EACH_COUNTER \
EXPAND_COUNTER(alloc_alloc_data) \
EXPAND_COUNTER(alloc_alloc_meta) \
EXPAND_COUNTER(alloc_free_data) \
EXPAND_COUNTER(alloc_free_meta) \
EXPAND_COUNTER(alloc_list_avail_lo) \
EXPAND_COUNTER(alloc_list_freed_hi) \
EXPAND_COUNTER(alloc_move) \
EXPAND_COUNTER(alloc_moved_extent) \
EXPAND_COUNTER(alloc_stale_list_block) \
EXPAND_COUNTER(block_cache_access_update) \
EXPAND_COUNTER(block_cache_alloc_failure) \
EXPAND_COUNTER(block_cache_alloc_page_order) \
EXPAND_COUNTER(block_cache_alloc_virt) \
EXPAND_COUNTER(block_cache_end_io_error) \
EXPAND_COUNTER(block_cache_forget) \
EXPAND_COUNTER(block_cache_free) \
EXPAND_COUNTER(block_cache_free_work) \
EXPAND_COUNTER(block_cache_remove_stale) \
EXPAND_COUNTER(block_cache_shrink) \
EXPAND_COUNTER(block_cache_shrink_next) \
EXPAND_COUNTER(block_cache_shrink_recent) \
EXPAND_COUNTER(block_cache_shrink_remove) \
EXPAND_COUNTER(block_cache_shrink_stop) \
EXPAND_COUNTER(btree_compact_values) \
EXPAND_COUNTER(btree_compact_values_enomem) \
EXPAND_COUNTER(btree_delete) \
EXPAND_COUNTER(btree_dirty) \
EXPAND_COUNTER(btree_force) \
EXPAND_COUNTER(btree_join) \
EXPAND_COUNTER(btree_insert) \
EXPAND_COUNTER(btree_leaf_item_hash_search) \
EXPAND_COUNTER(btree_lookup) \
EXPAND_COUNTER(btree_merge) \
EXPAND_COUNTER(btree_merge_alloc_low) \
EXPAND_COUNTER(btree_merge_delete) \
EXPAND_COUNTER(btree_merge_delta_combined) \
EXPAND_COUNTER(btree_merge_delta_null) \
EXPAND_COUNTER(btree_merge_dirty_limit) \
EXPAND_COUNTER(btree_merge_drop_old) \
EXPAND_COUNTER(btree_merge_insert) \
EXPAND_COUNTER(btree_merge_update) \
EXPAND_COUNTER(btree_merge_walk) \
EXPAND_COUNTER(btree_next) \
EXPAND_COUNTER(btree_prev) \
EXPAND_COUNTER(btree_split) \
EXPAND_COUNTER(btree_stale_read) \
EXPAND_COUNTER(btree_update) \
EXPAND_COUNTER(btree_walk) \
EXPAND_COUNTER(btree_walk_restart) \
EXPAND_COUNTER(client_farewell_error) \
EXPAND_COUNTER(corrupt_btree_block_level) \
EXPAND_COUNTER(corrupt_btree_no_child_ref) \
EXPAND_COUNTER(corrupt_dirent_backref_name_len) \
EXPAND_COUNTER(corrupt_dirent_name_len) \
EXPAND_COUNTER(corrupt_dirent_readdir_name_len) \
EXPAND_COUNTER(corrupt_inode_block_counts) \
EXPAND_COUNTER(corrupt_symlink_inode_size) \
EXPAND_COUNTER(corrupt_symlink_missing_item) \
EXPAND_COUNTER(corrupt_symlink_not_null_term) \
EXPAND_COUNTER(data_fallocate_enobufs_retry) \
EXPAND_COUNTER(data_write_begin_enobufs_retry) \
EXPAND_COUNTER(dentry_revalidate_error) \
EXPAND_COUNTER(dentry_revalidate_invalid) \
EXPAND_COUNTER(dentry_revalidate_rcu) \
EXPAND_COUNTER(dentry_revalidate_root) \
EXPAND_COUNTER(dentry_revalidate_valid) \
EXPAND_COUNTER(dir_backref_excessive_retries) \
EXPAND_COUNTER(ext_op_insert) \
EXPAND_COUNTER(ext_op_next) \
EXPAND_COUNTER(ext_op_remove) \
EXPAND_COUNTER(forest_bloom_fail) \
EXPAND_COUNTER(forest_bloom_pass) \
EXPAND_COUNTER(forest_bloom_stale) \
EXPAND_COUNTER(forest_read_items) \
EXPAND_COUNTER(forest_roots_next_hint) \
EXPAND_COUNTER(forest_set_bloom_bits) \
EXPAND_COUNTER(item_clear_dirty) \
EXPAND_COUNTER(item_create) \
EXPAND_COUNTER(item_delete) \
EXPAND_COUNTER(item_delta) \
EXPAND_COUNTER(item_delta_written) \
EXPAND_COUNTER(item_dirty) \
EXPAND_COUNTER(item_invalidate) \
EXPAND_COUNTER(item_invalidate_page) \
EXPAND_COUNTER(item_lookup) \
EXPAND_COUNTER(item_mark_dirty) \
EXPAND_COUNTER(item_next) \
EXPAND_COUNTER(item_page_accessed) \
EXPAND_COUNTER(item_page_alloc) \
EXPAND_COUNTER(item_page_clear_dirty) \
EXPAND_COUNTER(item_page_compact) \
EXPAND_COUNTER(item_page_free) \
EXPAND_COUNTER(item_page_lru_add) \
EXPAND_COUNTER(item_page_lru_remove) \
EXPAND_COUNTER(item_page_mark_dirty) \
EXPAND_COUNTER(item_page_rbtree_walk) \
EXPAND_COUNTER(item_page_split) \
EXPAND_COUNTER(item_pcpu_add_replaced) \
EXPAND_COUNTER(item_pcpu_page_hit) \
EXPAND_COUNTER(item_pcpu_page_miss) \
EXPAND_COUNTER(item_pcpu_page_miss_keys) \
EXPAND_COUNTER(item_read_pages_split) \
EXPAND_COUNTER(item_shrink_page) \
EXPAND_COUNTER(item_shrink_page_dirty) \
EXPAND_COUNTER(item_shrink_page_reader) \
EXPAND_COUNTER(item_shrink_page_trylock) \
EXPAND_COUNTER(item_update) \
EXPAND_COUNTER(item_write_dirty) \
EXPAND_COUNTER(lock_alloc) \
EXPAND_COUNTER(lock_free) \
EXPAND_COUNTER(lock_grant_request) \
EXPAND_COUNTER(lock_grant_response) \
EXPAND_COUNTER(lock_invalidate_coverage) \
EXPAND_COUNTER(lock_invalidate_inode) \
EXPAND_COUNTER(lock_invalidate_request) \
EXPAND_COUNTER(lock_invalidate_response) \
EXPAND_COUNTER(lock_invalidate_sync) \
EXPAND_COUNTER(lock_invalidate_work) \
EXPAND_COUNTER(lock_lock) \
EXPAND_COUNTER(lock_lock_error) \
EXPAND_COUNTER(lock_nonblock_eagain) \
EXPAND_COUNTER(lock_recover_request) \
EXPAND_COUNTER(lock_shrink_attempted) \
EXPAND_COUNTER(lock_shrink_aborted) \
EXPAND_COUNTER(lock_shrink_work) \
EXPAND_COUNTER(lock_unlock) \
EXPAND_COUNTER(lock_wait) \
EXPAND_COUNTER(net_dropped_response) \
EXPAND_COUNTER(net_send_bytes) \
EXPAND_COUNTER(net_send_error) \
EXPAND_COUNTER(net_send_messages) \
EXPAND_COUNTER(net_recv_bytes) \
EXPAND_COUNTER(net_recv_dropped_duplicate) \
EXPAND_COUNTER(net_recv_error) \
EXPAND_COUNTER(net_recv_invalid_message) \
EXPAND_COUNTER(net_recv_messages) \
EXPAND_COUNTER(net_unknown_request) \
EXPAND_COUNTER(orphan_scan) \
EXPAND_COUNTER(orphan_scan_attempts) \
EXPAND_COUNTER(orphan_scan_cached) \
EXPAND_COUNTER(orphan_scan_error) \
EXPAND_COUNTER(orphan_scan_item) \
EXPAND_COUNTER(orphan_scan_omap_set) \
EXPAND_COUNTER(quorum_candidate_server_stopping) \
EXPAND_COUNTER(quorum_elected) \
EXPAND_COUNTER(quorum_fence_error) \
EXPAND_COUNTER(quorum_fence_leader) \
EXPAND_COUNTER(quorum_read_invalid_block) \
EXPAND_COUNTER(quorum_recv_error) \
EXPAND_COUNTER(quorum_recv_heartbeat) \
EXPAND_COUNTER(quorum_recv_invalid) \
EXPAND_COUNTER(quorum_recv_resignation) \
EXPAND_COUNTER(quorum_recv_vote) \
EXPAND_COUNTER(quorum_send_heartbeat) \
EXPAND_COUNTER(quorum_send_heartbeat_dropped) \
EXPAND_COUNTER(quorum_send_resignation) \
EXPAND_COUNTER(quorum_send_request) \
EXPAND_COUNTER(quorum_send_vote) \
EXPAND_COUNTER(quorum_server_shutdown) \
EXPAND_COUNTER(quorum_term_follower) \
EXPAND_COUNTER(server_commit_hold) \
EXPAND_COUNTER(server_commit_queue) \
EXPAND_COUNTER(server_commit_worker) \
EXPAND_COUNTER(srch_add_entry) \
EXPAND_COUNTER(srch_compact_dirty_block) \
EXPAND_COUNTER(srch_compact_entry) \
EXPAND_COUNTER(srch_compact_error) \
EXPAND_COUNTER(srch_compact_flush) \
EXPAND_COUNTER(srch_compact_log_page) \
EXPAND_COUNTER(srch_compact_removed_entry) \
EXPAND_COUNTER(srch_rotate_log) \
EXPAND_COUNTER(srch_search_log) \
EXPAND_COUNTER(srch_search_log_block) \
EXPAND_COUNTER(srch_search_retry_empty) \
EXPAND_COUNTER(srch_search_sorted) \
EXPAND_COUNTER(srch_search_sorted_block) \
EXPAND_COUNTER(srch_search_xattrs) \
EXPAND_COUNTER(srch_read_stale) \
EXPAND_COUNTER(statfs) \
EXPAND_COUNTER(totl_read_copied) \
EXPAND_COUNTER(totl_read_finalized) \
EXPAND_COUNTER(totl_read_fs) \
EXPAND_COUNTER(totl_read_item) \
EXPAND_COUNTER(totl_read_logged) \
EXPAND_COUNTER(trans_commit_data_alloc_low) \
EXPAND_COUNTER(trans_commit_dirty_meta_full) \
EXPAND_COUNTER(trans_commit_fsync) \
EXPAND_COUNTER(trans_commit_meta_alloc_low) \
EXPAND_COUNTER(trans_commit_sync_fs) \
EXPAND_COUNTER(trans_commit_timer) \
EXPAND_COUNTER(trans_commit_written)
#define FIRST_COUNTER alloc_alloc_data
#define LAST_COUNTER trans_commit_written
#undef EXPAND_COUNTER
#define EXPAND_COUNTER(which) struct percpu_counter which;
struct scoutfs_counters {
/* $sysfs/fs/scoutfs/$id/counters/ */
struct kobject kobj;
struct completion comp;
EXPAND_EACH_COUNTER
};
#define scoutfs_foreach_counter(sb, pcpu) \
for (pcpu = &SCOUTFS_SB(sb)->counters->FIRST_COUNTER; \
pcpu <= &SCOUTFS_SB(sb)->counters->LAST_COUNTER; \
pcpu++)
/*
* We always read with _sum, we have no use for the shared count and
* certainly don't want to pay the cost of a shared lock to update it.
* The default batch of 32 make counter increments show up significantly
* in profiles.
*/
#define SCOUTFS_PCPU_COUNTER_BATCH (1 << 30)
#define scoutfs_inc_counter(sb, which) \
__percpu_counter_add(&SCOUTFS_SB(sb)->counters->which, 1, \
SCOUTFS_PCPU_COUNTER_BATCH)
#define scoutfs_add_counter(sb, which, cnt) \
__percpu_counter_add(&SCOUTFS_SB(sb)->counters->which, cnt, \
SCOUTFS_PCPU_COUNTER_BATCH)
void __init scoutfs_init_counters(void);
int scoutfs_setup_counters(struct super_block *sb);
void scoutfs_destroy_counters(struct super_block *sb);
#endif
Reference in New Issue View Git Blame Copy Permalink