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Let default arc_c_max be platform dependent

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Linux changed the default max ARC size to 1/2 of physical memory to
deal with shortcomings of the Linux SLUB allocator.  Other platforms
do not require the same logic.

Implement an arc_default_max() function to determine a default max ARC
size in platform code.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Ryan Moeller <ryan@iXsystems.com>
Closes #10155
This commit is contained in:
Ryan Moeller
2020-03-27 12:14:46 -04:00
committed by GitHub
parent 3f38797338
commit 9a51738b60
4 changed files with 22 additions and 8 deletions
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module/zfs/arc.c
+6 -6
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@@ -7150,13 +7150,13 @@ arc_init(void)
arc_lowmem_init();
#endif
/* Set max to 1/2 of all memory */
arc_c_max = allmem / 2;
#ifdef _KERNEL
/* Set min cache to 1/32 of all memory, or 32MB, whichever is more */
/* Set min cache to 1/32 of all memory, or 32MB, whichever is more. */
arc_c_min = MAX(allmem / 32, 2ULL << SPA_MAXBLOCKSHIFT);
#else
/* How to set default max varies by platform. */
arc_c_max = arc_default_max(arc_c_min, allmem);
#ifndef _KERNEL
/*
* In userland, there's only the memory pressure that we artificially
* create (see arc_available_memory()). Don't let arc_c get too