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zfs_debug: Restore log size limit for userspace

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For some reason it was dropped when split from kernel, that makes
raidz_test to accumulate in RAM up to 100GB of logs we don't need.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Reviewed-by:  Rob Norris <robn@despairlabs.com>
Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #16492
Closes #16566
Closes #16664
This commit is contained in:
Alexander Motin 2024-10-20 12:39:05 -04:00 committed by Brian Behlendorf
parent b4cd10ce5b
commit ace2e17a9b
1 changed files with 18 additions and 0 deletions
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18
lib/libzpool/zfs_debug.c
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@ -35,9 +35,25 @@ typedef struct zfs_dbgmsg {
static list_t zfs_dbgmsgs;
static kmutex_t zfs_dbgmsgs_lock;
static uint_t zfs_dbgmsg_size = 0;
static uint_t zfs_dbgmsg_maxsize = 4<<20; /* 4MB */
int zfs_dbgmsg_enable = B_TRUE;
static void
zfs_dbgmsg_purge(uint_t max_size)
{
while (zfs_dbgmsg_size > max_size) {
zfs_dbgmsg_t *zdm = list_remove_head(&zfs_dbgmsgs);
if (zdm == NULL)
return;
uint_t size = zdm->zdm_size;
kmem_free(zdm, size);
zfs_dbgmsg_size -= size;
}
}
void
zfs_dbgmsg_init(void)
{
@ -74,6 +90,8 @@ __zfs_dbgmsg(char *buf)
mutex_enter(&zfs_dbgmsgs_lock);
list_insert_tail(&zfs_dbgmsgs, zdm);
zfs_dbgmsg_size += size;
zfs_dbgmsg_purge(zfs_dbgmsg_maxsize);
mutex_exit(&zfs_dbgmsgs_lock);
}