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Set arc_c_min properly in userland builds

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Since it's set to arc_c_max / 2, it must be set after arc_c_max is set.
Also added protection against it falling below 2 * maxblocksize in
userland builds.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #4268
This commit is contained in:
Tim Chase 2016-01-24 13:11:15 -06:00 committed by Brian Behlendorf
parent 1b8951b319
commit 0a1f8cd999
1 changed files with 4 additions and 4 deletions
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8
module/zfs/arc.c
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@ -5403,6 +5403,9 @@ arc_init(void)
arc_need_free = 0;
#endif
/* Set max to 1/2 of all memory */
arc_c_max = allmem / 2;
/*
* In userland, there's only the memory pressure that we artificially
* create (see arc_available_memory()). Don't let arc_c get too
@ -5410,14 +5413,11 @@ arc_init(void)
* arc_c, causing arc_tempreserve_space() to fail.
*/
#ifndef _KERNEL
arc_c_min = arc_c_max / 2;
arc_c_min = MAX(arc_c_max / 2, 2ULL << SPA_MAXBLOCKSHIFT);
#else
arc_c_min = 2ULL << SPA_MAXBLOCKSHIFT;
#endif
/* Set max to 1/2 of all memory */
arc_c_max = allmem / 2;
arc_c = arc_c_max;
arc_p = (arc_c >> 1);