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Clean up OS-specific ARC and kmem code

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OS-specific code (e.g. under `module/os/linux`) does not need to share
its code structure with any other operating systems.  In particular, the
ARC and kmem code need not be similar to the code in illumos, because we
won't be syncing this OS-specific code between operating systems.  For
example, if/when illumos support is added to the common repo, we would
add a file `module/os/illumos/zfs/arc_os.c` for the illumos versions of
this code.

Therefore, we can simplify the code in the OS-specific ARC and kmem
routines.

These changes do not impact system behavior, they are purely code
cleanup.  The changes are:

Arenas are not used on Linux or FreeBSD (they are always `NULL`), so
`heap_arena`, `zio_arena`, and `zio_alloc_arena` can be removed, along
with code that uses them.

In `arc_available_memory()`:
 * `desfree` is unused, remove it
 * rename `freemem` to avoid conflict with pre-existing `#define`
 * remove checks related to arenas
 * use units of bytes, rather than converting from bytes to pages and
   then back to bytes

`SPL_KMEM_CACHE_REAP` is unused, remove it.

`skc_reap` is unused, remove it.

The `count` argument to `spl_kmem_cache_reap_now()` is unused, remove
it.

`vmem_size()` and associated type and macros are unused, remove them.

In `arc_memory_throttle()`, use a less confusing variable name to store
the result of `arc_free_memory()`.

Reviewed-by: George Wilson <gwilson@delphix.com>
Reviewed-by: Pavel Zakharov <pavel.zakharov@delphix.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Ryan Moeller <ryan@ixsystems.com>
Signed-off-by: Matthew Ahrens <mahrens@delphix.com>
Closes #10499
This commit is contained in:
Matthew Ahrens
2020-06-29 09:01:07 -07:00
committed by GitHub
parent 94a2dca6a0
commit 3c42c9ed84
11 changed files with 11 additions and 176 deletions
Download Patch File Download Diff File Expand all files Collapse all files
module/os/freebsd/zfs/arc_os.c
-26
View File
@@ -48,13 +48,6 @@
extern struct vfsops zfs_vfsops;
/* vmem_size typemask */
#define VMEM_ALLOC 0x01
#define VMEM_FREE 0x02
#define VMEM_MAXFREE 0x10
typedef size_t vmem_size_t;
extern vmem_size_t vmem_size(vmem_t *vm, int typemask);
uint_t zfs_arc_free_target = 0;
int64_t last_free_memory;
@@ -135,25 +128,6 @@ arc_available_memory(void)
}
#endif
/*
* If zio data pages are being allocated out of a separate heap segment,
* then enforce that the size of available vmem for this arena remains
* above about 1/4th (1/(2^arc_zio_arena_free_shift)) free.
*
* Note that reducing the arc_zio_arena_free_shift keeps more virtual
* memory (in the zio_arena) free, which can avoid memory
* fragmentation issues.
*/
if (zio_arena != NULL) {
n = (int64_t)vmem_size(zio_arena, VMEM_FREE) -
(vmem_size(zio_arena, VMEM_ALLOC) >>
arc_zio_arena_free_shift);
if (n < lowest) {
lowest = n;
r = FMR_ZIO_ARENA;
}
}
last_free_memory = lowest;
last_free_reason = r;
DTRACE_PROBE2(arc__available_memory, int64_t, lowest, int, r);