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Fix zpool history unbounded memory usage

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In original implementation, zpool history will read the whole history
before printing anything, causing memory usage goes unbounded. We fix
this by breaking it into read-print iterations.

Reviewed-by: Tom Caputi <tcaputi@datto.com>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Reviewed-by: Igor Kozhukhov <igor@dilos.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Chunwei Chen <david.chen@nutanix.com>
Closes #9516
This commit is contained in:
Chunwei Chen
2019-10-28 09:49:44 -07:00
committed by Brian Behlendorf
parent e35704647e
commit 7125a109dc
3 changed files with 41 additions and 26 deletions
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include/libzfs.h
+2 -1
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@@ -432,7 +432,8 @@ typedef enum {
extern char *zpool_vdev_name(libzfs_handle_t *, zpool_handle_t *, nvlist_t *,
int name_flags);
extern int zpool_upgrade(zpool_handle_t *, uint64_t);
extern int zpool_get_history(zpool_handle_t *, nvlist_t **);
extern int zpool_get_history(zpool_handle_t *, nvlist_t **, uint64_t *,
boolean_t *);
extern int zpool_events_next(libzfs_handle_t *, nvlist_t **, int *, unsigned,
int);
extern int zpool_events_clear(libzfs_handle_t *, int *);