diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 18 |
1 files changed, 15 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index e9404290f2c6..27dbfc1193b4 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -47,6 +47,7 @@ #include <linux/splice.h> #include <linux/rcupdate_wait.h> #include <linux/sched/mm.h> +#include <linux/sysctl.h> #include <asm/pgalloc.h> #include <asm/tlbflush.h> #include "internal.h" @@ -1077,6 +1078,19 @@ static wait_queue_head_t *folio_waitqueue(struct folio *folio) return &folio_wait_table[hash_ptr(folio, PAGE_WAIT_TABLE_BITS)]; } +/* How many times do we accept lock stealing from under a waiter? */ +static int sysctl_page_lock_unfairness = 5; +static const struct ctl_table filemap_sysctl_table[] = { + { + .procname = "page_lock_unfairness", + .data = &sysctl_page_lock_unfairness, + .maxlen = sizeof(sysctl_page_lock_unfairness), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = SYSCTL_ZERO, + } +}; + void __init pagecache_init(void) { int i; @@ -1085,6 +1099,7 @@ void __init pagecache_init(void) init_waitqueue_head(&folio_wait_table[i]); page_writeback_init(); + register_sysctl_init("vm", filemap_sysctl_table); } /* @@ -1232,9 +1247,6 @@ static inline bool folio_trylock_flag(struct folio *folio, int bit_nr, return true; } -/* How many times do we accept lock stealing from under a waiter? */ -int sysctl_page_lock_unfairness = 5; - static inline int folio_wait_bit_common(struct folio *folio, int bit_nr, int state, enum behavior behavior) { |