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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, Vlastimil Babka <vbabka@suse.cz>,
	Marcelo Tosatti <mtosatti@redhat.com>
Subject: [PATCH v5 02/12] this_cpu_cmpxchg: loongarch: switch this_cpu_cmpxchg to locked, add _local function
Date: Mon, 13 Mar 2023 13:25:09 -0300	[thread overview]
Message-ID: <20230313162634.309252817@redhat.com> (raw)
In-Reply-To: 20230313162507.032200398@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>
 



  parent reply	other threads:[~2023-03-13 16:29 UTC|newest]

Thread overview: 20+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-03-13 16:25 [PATCH v5 00/12] fold per-CPU vmstats remotely Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 01/12] this_cpu_cmpxchg: ARM64: switch this_cpu_cmpxchg to locked, add _local function Marcelo Tosatti
2023-03-13 16:25 ` Marcelo Tosatti [this message]
2023-03-13 16:25 ` [PATCH v5 03/12] this_cpu_cmpxchg: S390: " Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 04/12] this_cpu_cmpxchg: x86: " Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 05/12] add this_cpu_cmpxchg_local and asm-generic definitions Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 06/12] convert this_cpu_cmpxchg users to this_cpu_cmpxchg_local Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 07/12] mm/vmstat: switch counter modification to cmpxchg Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 08/12] vmstat: switch per-cpu vmstat counters to 32-bits Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 09/12] mm/vmstat: use xchg in cpu_vm_stats_fold Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 10/12] mm/vmstat: switch vmstat shepherd to flush per-CPU counters remotely Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 11/12] mm/vmstat: refresh stats remotely instead of via work item Marcelo Tosatti
2023-03-13 16:25 ` [PATCH v5 12/12] vmstat: add pcp remote node draining via cpu_vm_stats_fold Marcelo Tosatti
2023-03-14 12:25 ` [PATCH v5 00/12] fold per-CPU vmstats remotely Michal Hocko
2023-03-14 12:59   ` Marcelo Tosatti
2023-03-14 13:00     ` Marcelo Tosatti
2023-03-14 14:31     ` Michal Hocko
2023-03-14 18:49       ` Marcelo Tosatti
2023-03-14 21:01         ` Michal Hocko
2023-03-15  0:29           ` Marcelo Tosatti

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