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module/*.ko: prune .data, global .rodata

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Evaluated every variable that lives in .data (and globals in .rodata)
in the kernel modules, and constified/eliminated/localised them
appropriately. This means that all read-only data is now actually
read-only data, and, if possible, at file scope. A lot of previously-
global-symbols became inlinable (and inlined!) constants. Probably
not in a big Wowee Performance Moment, but hey.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz>
Closes #12899
This commit is contained in:
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2022-01-15 00:37:55 +01:00
committed by GitHub
parent 7adc190098
commit 18168da727
147 changed files with 781 additions and 876 deletions
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module/zfs/refcount.c
+5 -5
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@@ -26,15 +26,15 @@
#include <sys/zfs_context.h>
#include <sys/zfs_refcount.h>
#ifdef ZFS_DEBUG
/*
* Reference count tracking is disabled by default. It's memory requirements
* are reasonable, however as implemented it consumes a significant amount of
* cpu time. Until its performance is improved it should be manually enabled.
*/
int reference_tracking_enable = FALSE;
int reference_history = 3; /* tunable */
int reference_tracking_enable = B_FALSE;
static int reference_history = 3; /* tunable */
#ifdef ZFS_DEBUG
static kmem_cache_t *reference_cache;
static kmem_cache_t *reference_history_cache;
@@ -327,10 +327,10 @@ EXPORT_SYMBOL(zfs_refcount_remove);
EXPORT_SYMBOL(zfs_refcount_held);
/* BEGIN CSTYLED */
ZFS_MODULE_PARAM(zfs, ,reference_tracking_enable, INT, ZMOD_RW,
ZFS_MODULE_PARAM(zfs, , reference_tracking_enable, INT, ZMOD_RW,
"Track reference holders to refcount_t objects");
ZFS_MODULE_PARAM(zfs, ,reference_history, INT, ZMOD_RW,
ZFS_MODULE_PARAM(zfs, , reference_history, INT, ZMOD_RW,
"Maximum reference holders being tracked");
/* END CSTYLED */
#endif /* ZFS_DEBUG */