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geli: add a read-only kern.geom.eli.use_uma_bytes sysctl

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It reports the value of the g_eli_alloc_sz variable.  Allocations of
this size or less will use UMA.  Larger allocations will use malloc.
Since malloc is slower, it is useful for users to know this variable so
they can avoid such allocations.  For example, ZFS users can set
vfs.zfs.vdev.aggregation_limit to this value.

MFC after:	1 week
Sponsored by:	Axcient
Reviewed by:	markj, imp
Differential Revision: https://reviews.freebsd.org/D44904
This commit is contained in:
Alan Somers 2024-04-22 12:03:40 -06:00
parent 5cafc38f11
commit 3acf3feaa8
1 changed files with 3 additions and 1 deletions
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4
sys/geom/eli/g_eli.c
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@ -100,11 +100,13 @@ SYSCTL_BOOL(_kern_geom_eli, OID_AUTO, blocking_malloc, CTLFLAG_RWTUN,
static bool g_eli_unmapped_io = true;
SYSCTL_BOOL(_kern_geom_eli, OID_AUTO, unmapped_io, CTLFLAG_RDTUN,
&g_eli_unmapped_io, 0, "Enable support for unmapped I/O");
static int g_eli_alloc_sz;
SYSCTL_UINT(_kern_geom_eli, OID_AUTO, use_uma_bytes, CTLFLAG_RD,
&g_eli_alloc_sz, 0, "Use uma(9) for allocations of this size or smaller.");
static struct sx g_eli_umalock; /* Controls changes to UMA zone. */
SX_SYSINIT(g_eli_umalock, &g_eli_umalock, "GELI UMA");
static uma_zone_t g_eli_uma = NULL;
static int g_eli_alloc_sz;
static volatile int g_eli_umaoutstanding;
static volatile int g_eli_devs;