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lib: Upgrade to full flush if size is at least threshold 

Currently, we upgrade to a full tlb flush only If a tlb flush request
size is greater than the threshold. This is done as sfence in RISC-V
can only flush 4KB at a time. Doing a large number of flushes page by
page impacts the performance. It is better to do a full tlbflush if the
request size is at least equal to the threshold size.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Atish Patra 2019-08-29 15:19:13 -07:00 committed by Anup Patel
parent 6bd1512024
commit 7b7690ed9c
1 changed files with 1 additions and 1 deletions
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lib/sbi/sbi_tlb.c
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@ -232,7 +232,7 @@ int sbi_tlb_fifo_update(struct sbi_scratch *rscratch, u32 hartid, void *data)
* upgrade it to flush all because we can only flush * upgrade it to flush all because we can only flush
* 4KB at a time. * 4KB at a time.
*/ */
if (tinfo->size >= SBI_TLB_FLUSH_MAX_SIZE) { if (tinfo->size > SBI_TLB_FLUSH_MAX_SIZE) {
tinfo->start = 0; tinfo->start = 0;
tinfo->size = SBI_TLB_FLUSH_ALL; tinfo->size = SBI_TLB_FLUSH_ALL;
} }