diff options
| -rw-r--r-- | arch/sparc/mm/tsb.c | 21 | ||||
| -rw-r--r-- | kernel/sysctl.c | 14 |
2 files changed, 28 insertions, 7 deletions
diff --git a/arch/sparc/mm/tsb.c b/arch/sparc/mm/tsb.c index f0282fad632a..36a0813f9517 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; diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 3d56fe7570da..4e2ac0aec9b0 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -121,6 +121,10 @@ extern int sg_big_buff; #include <asm/system.h> #endif +#ifdef CONFIG_SPARC64 +extern int sysctl_tsb_ratio; +#endif + #ifdef __hppa__ extern int pwrsw_enabled; extern int unaligned_enabled; @@ -451,6 +455,16 @@ static struct ctl_table kern_table[] = { .proc_handler = &proc_dointvec, }, #endif +#ifdef CONFIG_SPARC64 + { + .ctl_name = CTL_UNNUMBERED, + .procname = "tsb-ratio", + .data = &sysctl_tsb_ratio, + .maxlen = sizeof (int), + .mode = 0644, + .proc_handler = &proc_dointvec, + }, +#endif #ifdef __hppa__ { .ctl_name = KERN_HPPA_PWRSW, |
