From: Marcelo Tosatti <mtosatti@redhat.com>
To: Christoph Lameter <cl@linux.com>
Cc: Aaron Tomlin <atomlin@atomlin.com>,
Frederic Weisbecker <frederic@kernel.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Russell King <linux@armlinux.org.uk>,
Huacai Chen <chenhuacai@kernel.org>,
Heiko Carstens <hca@linux.ibm.com>,
x86@kernel.org, Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH v4 03/12] this_cpu_cmpxchg: loongarch: switch this_cpu_cmpxchg to locked, add _local function
Date: Sun, 05 Mar 2023 10:37:00 -0300 [thread overview]
Message-ID: <20230305134053.487486353@redhat.com> (raw)
In-Reply-To: <20230305133657.255737580@redhat.com>
Goal is to have vmstat_shepherd to transfer from
per-CPU counters to global counters remotely. For this,
an atomic this_cpu_cmpxchg is necessary.
Following the kernel convention for cmpxchg/cmpxchg_local,
add this_cpu_cmpxchg_local helpers to Loongarch.
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Index: linux-vmstat-remote/arch/loongarch/include/asm/percpu.h
===================================================================
--- linux-vmstat-remote.orig/arch/loongarch/include/asm/percpu.h
+++ linux-vmstat-remote/arch/loongarch/include/asm/percpu.h
@@ -150,6 +150,16 @@ static inline unsigned long __percpu_xch
}
/* this_cpu_cmpxchg */
+#define _protect_cmpxchg(pcp, o, n) \
+({ \
+ typeof(*raw_cpu_ptr(&(pcp))) __ret; \
+ preempt_disable_notrace(); \
+ __ret = cmpxchg(raw_cpu_ptr(&(pcp)), o, n); \
+ preempt_enable_notrace(); \
+ __ret; \
+})
+
+/* this_cpu_cmpxchg_local */
#define _protect_cmpxchg_local(pcp, o, n) \
({ \
typeof(*raw_cpu_ptr(&(pcp))) __ret; \
@@ -222,10 +232,15 @@ do { \
#define this_cpu_xchg_4(pcp, val) _percpu_xchg(pcp, val)
#define this_cpu_xchg_8(pcp, val) _percpu_xchg(pcp, val)
-#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
-#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
-#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
-#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
+#define this_cpu_cmpxchg_local_1(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
+#define this_cpu_cmpxchg_local_2(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
+#define this_cpu_cmpxchg_local_4(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
+#define this_cpu_cmpxchg_local_8(ptr, o, n) _protect_cmpxchg_local(ptr, o, n)
+
+#define this_cpu_cmpxchg_1(ptr, o, n) _protect_cmpxchg(ptr, o, n)
+#define this_cpu_cmpxchg_2(ptr, o, n) _protect_cmpxchg(ptr, o, n)
+#define this_cpu_cmpxchg_4(ptr, o, n) _protect_cmpxchg(ptr, o, n)
+#define this_cpu_cmpxchg_8(ptr, o, n) _protect_cmpxchg(ptr, o, n)
#include <asm-generic/percpu.h>
next prev parent reply other threads:[~2023-03-05 13:41 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-03-05 13:36 [PATCH v4 00/12] fold per-CPU vmstats remotely Marcelo Tosatti
2023-03-05 13:36 ` [PATCH v4 01/12] mm/vmstat: remove remote node draining Marcelo Tosatti
2023-03-09 17:11 ` Vlastimil Babka
2023-03-13 16:41 ` Marcelo Tosatti
2023-03-05 13:36 ` [PATCH v4 02/12] this_cpu_cmpxchg: ARM64: switch this_cpu_cmpxchg to locked, add _local function Marcelo Tosatti
2023-03-05 13:37 ` Marcelo Tosatti [this message]
2023-03-05 13:37 ` [PATCH v4 04/12] this_cpu_cmpxchg: S390: " Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 05/12] this_cpu_cmpxchg: x86: " Marcelo Tosatti
2023-03-06 11:22 ` Peter Zijlstra
2023-03-08 21:42 ` Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 06/12] add this_cpu_cmpxchg_local and asm-generic definitions Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 07/12] convert this_cpu_cmpxchg users to this_cpu_cmpxchg_local Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 08/12] mm/vmstat: switch counter modification to cmpxchg Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 09/12] vmstat: switch per-cpu vmstat counters to 32-bits Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 10/12] mm/vmstat: use xchg in cpu_vm_stats_fold Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 11/12] mm/vmstat: switch vmstat shepherd to flush per-CPU counters remotely Marcelo Tosatti
2023-03-05 13:37 ` [PATCH v4 12/12] mm/vmstat: refresh stats remotely instead of via work item Marcelo Tosatti
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