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| author | Nicholas Piggin <npiggin@gmail.com> | 2021-05-03 12:17:55 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2021-05-04 04:06:45 +0300 |
| commit | 8abddd968a303db75e4debe77a3df484164f1f33 (patch) | |
| tree | b3ea95c6553f6738df1ca51c25794c701e7f69d0 /Documentation/admin-guide | |
| parent | 562d1e207d322e6346e8db91bbd11d94f16427d2 (diff) | |
| download | linux-8abddd968a303db75e4debe77a3df484164f1f33.tar.xz | |
powerpc/64s/radix: Enable huge vmalloc mappings
This reduces TLB misses by nearly 30x on a `git diff` workload on a
2-node POWER9 (59,800 -> 2,100) and reduces CPU cycles by 0.54%, due
to vfs hashes being allocated with 2MB pages.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210503091755.613393-1-npiggin@gmail.com
Diffstat (limited to 'Documentation/admin-guide')
| -rw-r--r-- | Documentation/admin-guide/kernel-parameters.txt | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt index 02470ba1fe6a..1fcec80b099e 100644 --- a/Documentation/admin-guide/kernel-parameters.txt +++ b/Documentation/admin-guide/kernel-parameters.txt @@ -3251,6 +3251,8 @@ nohugeiomap [KNL,X86,PPC,ARM64] Disable kernel huge I/O mappings. + nohugevmalloc [PPC] Disable kernel huge vmalloc mappings. + nosmt [KNL,S390] Disable symmetric multithreading (SMT). Equivalent to smt=1. |