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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 Tony Hutter
parent 46bc182a5d
commit 3a8e23d0f8
6 changed files with 46 additions and 1 deletions
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module/os/linux/spl/spl-thread.c
+12
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@@ -27,6 +27,7 @@
#include <sys/kmem.h>
#include <sys/tsd.h>
#include <sys/string.h>
#include <sys/misc.h>
/*
* Thread interfaces
@@ -196,3 +197,14 @@ issig(void)
}
EXPORT_SYMBOL(issig);
/*
* Check if the current thread is a memory reclaim thread.
* Returns true if current thread is kswapd.
*/
int
current_is_reclaim_thread(void)
{
return (current_is_kswapd());
}
EXPORT_SYMBOL(current_is_reclaim_thread);