diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2018-09-14 18:30:50 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-09-19 14:59:44 +0300 |
| commit | 82d8f4c22f3514eface7e082750bc917193d91f9 (patch) | |
| tree | fb4623b052c28a5caf07bd2ff128d7931fe3ce30 /arch/powerpc/xmon/xmon.c | |
| parent | 5141c182d75b4004c41ac2dc5af081b457b3e8cb (diff) | |
| download | linux-82d8f4c22f3514eface7e082750bc917193d91f9.tar.xz | |
powerpc/64s/hash: Use POWER9 SLBIA IH=3 variant in switch_slb
POWER9 introduces SLBIA IH=3, which invalidates all SLB entries and
associated lookaside information that have a class value of 1, which
Linux assigns to user addresses. This matches what switch_slb wants,
and allows a simple fast implementation that avoids the slb_cache
complexity.
As a side-effect, the POWER5 < DD2.1 SLB invalidation workaround is
also avoided on POWER9.
Process context switching rate is improved about 2.2% for a small
process that hits the slb cache which is the best case for the current
code.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/xmon/xmon.c')
| -rw-r--r-- | arch/powerpc/xmon/xmon.c | 11 |
1 files changed, 7 insertions, 4 deletions
diff --git a/arch/powerpc/xmon/xmon.c b/arch/powerpc/xmon/xmon.c index 4264aedc7775..cd43c168dc1b 100644 --- a/arch/powerpc/xmon/xmon.c +++ b/arch/powerpc/xmon/xmon.c @@ -2393,10 +2393,13 @@ static void dump_one_paca(int cpu) } } DUMP(p, vmalloc_sllp, "%#-*x"); - DUMP(p, slb_cache_ptr, "%#-*x"); - for (i = 0; i < SLB_CACHE_ENTRIES; i++) - printf(" %-*s[%d] = 0x%016x\n", - 22, "slb_cache", i, p->slb_cache[i]); + + if (!early_cpu_has_feature(CPU_FTR_ARCH_300)) { + DUMP(p, slb_cache_ptr, "%#-*x"); + for (i = 0; i < SLB_CACHE_ENTRIES; i++) + printf(" %-*s[%d] = 0x%016x\n", + 22, "slb_cache", i, p->slb_cache[i]); + } DUMP(p, rfi_flush_fallback_area, "%-*px"); #endif |