diff options
Diffstat (limited to 'arch/sparc/mm/tsb.c')
| -rw-r--r-- | arch/sparc/mm/tsb.c | 21 |
1 files changed, 14 insertions, 7 deletions
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c index f0282fad632..36a0813f951 100644 --- a/arch/sparc/mm/tsb.c +++ b/arch/sparc/mm/tsb.c @@ -265,6 +265,18 @@ void __init pgtable_cache_init(void) } } +int sysctl_tsb_ratio = -2; + +static unsigned long tsb_size_to_rss_limit(unsigned long new_size) +{ + unsigned long num_ents = (new_size / sizeof(struct tsb)); + + if (sysctl_tsb_ratio < 0) + return num_ents - (num_ents >> -sysctl_tsb_ratio); + else + return num_ents + (num_ents >> sysctl_tsb_ratio); +} + /* When the RSS of an address space exceeds tsb_rss_limit for a TSB, * do_sparc64_fault() invokes this routine to try and grow it. * @@ -295,19 +307,14 @@ void tsb_grow(struct mm_struct *mm, unsigned long tsb_index, unsigned long rss) new_cache_index = 0; for (new_size = 8192; new_size < max_tsb_size; new_size <<= 1UL) { - unsigned long n_entries = new_size / sizeof(struct tsb); - - n_entries = (n_entries * 3) / 4; - if (n_entries > rss) + new_rss_limit = tsb_size_to_rss_limit(new_size); + if (new_rss_limit > rss) break; - new_cache_index++; } if (new_size == max_tsb_size) new_rss_limit = ~0UL; - else - new_rss_limit = ((new_size / sizeof(struct tsb)) * 3) / 4; retry_tsb_alloc: gfp_flags = GFP_KERNEL; |