[PATCH] x86: Restore processing of cache size tunables in init_cacheinfo

[PATCH] x86: Restore processing of cache size tunables in init_cacheinfo

[Florian Weimer]

Fixes and partially reverts commit 59803e81f96b479c17f583b31eac44b5
("x86: Optimizing memcpy for AMD Zen architecture.").

---
 sysdeps/x86/cacheinfo.h | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
index 1296c93b2b..0aec0e2875 100644
--- a/sysdeps/x86/cacheinfo.h
+++ b/sysdeps/x86/cacheinfo.h
@@ -354,11 +354,9 @@ init_cacheinfo (void)
       }
     }
 
+  /* Prefer cache size configure via tuning.  */
   if (cpu_features->data_cache_size != 0)
-    {
-      if (data == 0 || cpu_features->basic.kind != arch_kind_amd)
-        data = cpu_features->data_cache_size;
-    }
+    data = cpu_features->data_cache_size;
 
   if (data > 0)
     {
@@ -370,11 +368,9 @@ init_cacheinfo (void)
       __x86_data_cache_size = data;
     }
 
+  /* Prefer cache size configure via tuning.  */
   if (cpu_features->shared_cache_size != 0)
-    {
-      if (shared == 0 || cpu_features->basic.kind != arch_kind_amd)
-        shared = cpu_features->shared_cache_size;
-    }
+    shared = cpu_features->shared_cache_size;
 
   if (shared > 0)
     {

-- 
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Commercial register: Amtsgericht Muenchen, HRB 153243,
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Re: [PATCH] x86: Restore processing of cache size tunables in init_cacheinfo

[H.J. Lu]

LGTM. Thanks.

On Wed, Oct 28, 2020, 8:12 AM Florian Weimer <fweimer@redhat.com> wrote:

> Fixes and partially reverts commit 59803e81f96b479c17f583b31eac44b5
> ("x86: Optimizing memcpy for AMD Zen architecture.").
>
> ---
>  sysdeps/x86/cacheinfo.h | 12 ++++--------
>  1 file changed, 4 insertions(+), 8 deletions(-)
>
> diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
> index 1296c93b2b..0aec0e2875 100644
> --- a/sysdeps/x86/cacheinfo.h
> +++ b/sysdeps/x86/cacheinfo.h
> @@ -354,11 +354,9 @@ init_cacheinfo (void)
>        }
>      }
>
> +  /* Prefer cache size configure via tuning.  */
>    if (cpu_features->data_cache_size != 0)
> -    {
> -      if (data == 0 || cpu_features->basic.kind != arch_kind_amd)
> -        data = cpu_features->data_cache_size;
> -    }
> +    data = cpu_features->data_cache_size;
>
>    if (data > 0)
>      {
> @@ -370,11 +368,9 @@ init_cacheinfo (void)
>        __x86_data_cache_size = data;
>      }
>
> +  /* Prefer cache size configure via tuning.  */
>    if (cpu_features->shared_cache_size != 0)
> -    {
> -      if (shared == 0 || cpu_features->basic.kind != arch_kind_amd)
> -        shared = cpu_features->shared_cache_size;
> -    }
> +    shared = cpu_features->shared_cache_size;
>
>    if (shared > 0)
>      {
>
> --
> Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
> Commercial register: Amtsgericht Muenchen, HRB 153243,
> Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael
> O'Neill
>
>

RE: [PATCH] x86: Restore processing of cache size tunables in init_cacheinfo

[Karumanchi, Sajan]

[AMD Public Use]

Thanks, Florian for the quick fix.

Thanks & Regards,
Sajan K.

From: H.J. Lu <hjl.tools@gmail.com>
Sent: Wednesday, October 28, 2020 8:45 PM
To: Florian Weimer <fweimer@redhat.com>
Cc: GNU C Library <libc-alpha@sourceware.org>; Karumanchi, Sajan <Sajan.Karumanchi@amd.com>; Mallappa, Premachandra <Premachandra.Mallappa@amd.com>
Subject: Re: [PATCH] x86: Restore processing of cache size tunables in init_cacheinfo

[CAUTION: External Email]
LGTM. Thanks.

On Wed, Oct 28, 2020, 8:12 AM Florian Weimer <fweimer@redhat.com<mailto:fweimer@redhat.com>> wrote:
Fixes and partially reverts commit 59803e81f96b479c17f583b31eac44b5
("x86: Optimizing memcpy for AMD Zen architecture.").

---
 sysdeps/x86/cacheinfo.h | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/sysdeps/x86/cacheinfo.h b/sysdeps/x86/cacheinfo.h
index 1296c93b2b..0aec0e2875 100644
--- a/sysdeps/x86/cacheinfo.h
+++ b/sysdeps/x86/cacheinfo.h
@@ -354,11 +354,9 @@ init_cacheinfo (void)
       }
     }

+  /* Prefer cache size configure via tuning.  */
   if (cpu_features->data_cache_size != 0)
-    {
-      if (data == 0 || cpu_features->basic.kind != arch_kind_amd)
-        data = cpu_features->data_cache_size;
-    }
+    data = cpu_features->data_cache_size;

   if (data > 0)
     {
@@ -370,11 +368,9 @@ init_cacheinfo (void)
       __x86_data_cache_size = data;
     }

+  /* Prefer cache size configure via tuning.  */
   if (cpu_features->shared_cache_size != 0)
-    {
-      if (shared == 0 || cpu_features->basic.kind != arch_kind_amd)
-        shared = cpu_features->shared_cache_size;
-    }
+    shared = cpu_features->shared_cache_size;

   if (shared > 0)
     {

--
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