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| author | Helge Deller <deller@gmx.de> | 2019-08-12 19:13:20 +0200 |
|---|---|---|
| committer | Helge Deller <deller@gmx.de> | 2019-08-12 19:17:40 +0200 |
| commit | a5ff2130a4d98d22377e5fdab87d713f4b17f4f2 (patch) | |
| tree | 72d50c4107f39ee0482ef751c7ce9239a14d6f8d /arch/parisc | |
| parent | 82992fc70f98dee091faa926eb5cecadda5c84f4 (diff) | |
| download | linux-a5ff2130a4d98d22377e5fdab87d713f4b17f4f2.tar.gz | |
parisc: speed up flush_tlb_all_local with qemu
When started in qemu, we know that qemu will drop all local TLB entries on any pxtlbe instruction. So, if we detect qemu, replace the whole flush_tlb_all_local function by one pdtlbe instruction. Signed-off-by: Helge Deller <deller@gmx.de>
Diffstat (limited to 'arch/parisc')
| -rw-r--r-- | arch/parisc/kernel/pacache.S | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/parisc/kernel/pacache.S b/arch/parisc/kernel/pacache.S index df46b0e5a915..fa092ed1e837 100644 --- a/arch/parisc/kernel/pacache.S +++ b/arch/parisc/kernel/pacache.S @@ -174,6 +174,15 @@ fdtdone: 2: bv %r0(%r2) nop + + /* + * When running in qemu, drop whole flush_tlb_all_local function and + * replace by one pdtlbe instruction, for which QEMU will drop all + * local TLB entries. + */ +3: pdtlbe %r0(%sr1,%r0) + bv,n %r0(%r2) + ALTERNATIVE_CODE(flush_tlb_all_local, 2, ALT_COND_RUN_ON_QEMU, 3b) ENDPROC_CFI(flush_tlb_all_local) .import cache_info,data |