diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2020-05-11 15:58:24 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-05-20 16:39:58 +0300 |
| commit | 82a1b8ed5604cccf30b6ff03bcd61640cd26369b (patch) | |
| tree | 10edf3e4db0967b8a711e0808bc35c2d050f34b6 /arch/powerpc/mm/book3s64/hash_utils.c | |
| parent | a0594e89c9dc8e37883cc0d6642d1baad9c0744e (diff) | |
| download | linux-82a1b8ed5604cccf30b6ff03bcd61640cd26369b.tar.xz | |
powerpc/64s/hash: Add stress_slb kernel boot option to increase SLB faults
This option increases the number of SLB misses by limiting the number
of kernel SLB entries, and increased flushing of cached lookaside
information. This helps stress test difficult to hit paths in the
kernel.
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Relocate the code into arch/powerpc/mm, s/torture/stress/]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200511125825.3081305-1-mpe@ellerman.id.au
Diffstat (limited to 'arch/powerpc/mm/book3s64/hash_utils.c')
| -rw-r--r-- | arch/powerpc/mm/book3s64/hash_utils.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/mm/book3s64/hash_utils.c b/arch/powerpc/mm/book3s64/hash_utils.c index 3d727f73a8db..622c6e8e9fa6 100644 --- a/arch/powerpc/mm/book3s64/hash_utils.c +++ b/arch/powerpc/mm/book3s64/hash_utils.c @@ -66,6 +66,9 @@ #include <mm/mmu_decl.h> +#include "internal.h" + + #ifdef DEBUG #define DBG(fmt...) udbg_printf(fmt) #else @@ -870,6 +873,9 @@ static void __init htab_initialize(void) printk(KERN_INFO "Using 1TB segments\n"); } + if (stress_slb_enabled) + static_branch_enable(&stress_slb_key); + /* * Calculate the required size of the htab. We want the number of * PTEGs to equal one half the number of real pages. |