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Skip dbuf_evict_one() from dbuf_evict_notify() for reclaim thread

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Avoid calling dbuf_evict_one() from memory reclaim contexts (e.g. Linux
kswapd, FreeBSD pagedaemon). This prevents deadlock caused by reclaim
threads waiting for the dbuf hash lock in the call sequence:
dbuf_evict_one -> dbuf_destroy -> arc_buf_destroy

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <alexander.motin@TrueNAS.com>
Signed-off-by: Kaitlin Hoang <kthoang@amazon.com>
Closes #17561
This commit is contained in:
khoang98
2025-08-01 19:47:41 -04:00
committed by Alexander Motin
parent 4808641e71
commit c405a7a35c
6 changed files with 46 additions and 1 deletions
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include/os/freebsd/spl/sys/misc.h
+5
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@@ -56,4 +56,9 @@ struct opensolaris_utsname {
#define task_io_account_read(n)
#define task_io_account_write(n)
/*
* Check if the current thread is a memory reclaim thread.
*/
extern int current_is_reclaim_thread(void);
#endif /* _OPENSOLARIS_SYS_MISC_H_ */