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staging: lustre: obdclass: limit lu_site hash table size on clients 

Allocating a big hash table using the current formula
does not really work for clients. We will create new
hash table for each mount on a single client which is
a lot of memory more than expected.

This patch limits the hash table up to 8M for clients,
which has 524288 entries.

Signed-off-by: Li Dongyang <dongyang.li@anu.edu.au>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-7689
Reviewed-on: http://review.whamcloud.com/18048
Reviewed-by: Fan Yong <fan.yong@intel.com>
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Li Dongyang 2016-12-02 19:53:17 -05:00 committed by Greg Kroah-Hartman
parent bfb9944c21
commit 817990ba1a
1 changed files with 4 additions and 0 deletions
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4
drivers/staging/lustre/lustre/obdclass/lu_object.c
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@ -68,6 +68,7 @@ enum {
#define LU_SITE_BITS_MIN 12
#define LU_SITE_BITS_MAX 24
#define LU_SITE_BITS_MAX_CL 19
/**
* total 256 buckets, we don't want too many buckets because:
* - consume too much memory
@ -878,6 +879,9 @@ static unsigned long lu_htable_order(struct lu_device *top)
unsigned long cache_size;
unsigned long bits;
if (!strcmp(top->ld_type->ldt_name, LUSTRE_VVP_NAME))
bits_max = LU_SITE_BITS_MAX_CL;
/*
* Calculate hash table size, assuming that we want reasonable
* performance when 20% of total memory is occupied by cache of