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Fri, 24 Jan 2025 23:55:26 +0000 (GMT) Received: from pps.filterd (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (8.18.1.2/8.18.1.2) with ESMTP id 50OMEpto036739; Fri, 24 Jan 2025 23:55:25 GMT Received: from pps.reinject (localhost [127.0.0.1]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTPS id 44917u4aav-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 24 Jan 2025 23:55:25 +0000 Received: from phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 50ONsxPs018051; Fri, 24 Jan 2025 23:55:24 GMT Received: from localhost.us.oracle.com (dhcp-10-65-130-174.vpn.oracle.com [10.65.130.174]) by phxpaimrmta01.imrmtpd1.prodappphxaev1.oraclevcn.com (PPS) with ESMTP id 44917u49ww-7; Fri, 24 Jan 2025 23:55:24 +0000 From: Anthony Yznaga To: akpm@linux-foundation.org, willy@infradead.org, markhemm@googlemail.com, viro@zeniv.linux.org.uk, david@redhat.com, khalid@kernel.org Cc: anthony.yznaga@oracle.com, jthoughton@google.com, corbet@lwn.net, dave.hansen@intel.com, kirill@shutemov.name, luto@kernel.org, brauner@kernel.org, arnd@arndb.de, ebiederm@xmission.com, catalin.marinas@arm.com, mingo@redhat.com, peterz@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, vbabka@suse.cz, jannh@google.com, hannes@cmpxchg.org, mhocko@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev, muchun.song@linux.dev, tglx@linutronix.de, cgroups@vger.kernel.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, mhiramat@kernel.org, rostedt@goodmis.org, vasily.averin@linux.dev, xhao@linux.alibaba.com, pcc@google.com, neilb@suse.de, maz@kernel.org Subject: [PATCH 06/20] mm/mshare: Add a vma flag to indicate an mshare region Date: Fri, 24 Jan 2025 15:54:40 -0800 Message-ID: <20250124235454.84587-7-anthony.yznaga@oracle.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: <20250124235454.84587-1-anthony.yznaga@oracle.com> References: <20250124235454.84587-1-anthony.yznaga@oracle.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-01-24_10,2025-01-23_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 adultscore=0 phishscore=0 mlxscore=0 spamscore=0 mlxlogscore=724 bulkscore=0 malwarescore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2411120000 definitions=main-2501240162 X-Proofpoint-GUID: fAnTHbbqevGjh-8GbPtHZ8_gFx9Uqmua X-Proofpoint-ORIG-GUID: fAnTHbbqevGjh-8GbPtHZ8_gFx9Uqmua Content-Type: text/plain; charset="utf-8" From: Khalid Aziz An mshare region contains zero or more actual vmas that map objects in the mshare range with shared page tables. Signed-off-by: Khalid Aziz Signed-off-by: Matthew Wilcox (Oracle) Signed-off-by: Anthony Yznaga --- include/linux/mm.h | 19 +++++++++++++++++++ include/trace/events/mmflags.h | 7 +++++++ 2 files changed, 26 insertions(+) diff --git a/include/linux/mm.h b/include/linux/mm.h index 8483e09aeb2c..bca7aee40f4d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -440,6 +440,13 @@ extern unsigned int kobjsize(const void *objp); #define VM_DROPPABLE VM_NONE #endif =20 +#ifdef CONFIG_MSHARE +#define VM_MSHARE_BIT 41 +#define VM_MSHARE BIT(VM_MSHARE_BIT) +#else +#define VM_MSHARE VM_NONE +#endif + #ifdef CONFIG_64BIT /* VM is sealed, in vm_flags */ #define VM_SEALED _BITUL(63) @@ -1092,6 +1099,18 @@ static inline bool vma_is_anon_shmem(struct vm_area_= struct *vma) { return false; =20 int vma_is_stack_for_current(struct vm_area_struct *vma); =20 +#ifdef CONFIG_MSHARE +static inline bool vma_is_mshare(const struct vm_area_struct *vma) +{ + return vma->vm_flags & VM_MSHARE; +} +#else +static inline bool vma_is_mshare(const struct vm_area_struct *vma) +{ + return false; +} +#endif + /* flush_tlb_range() takes a vma, not a mm, and can care about flags */ #define TLB_FLUSH_VMA(mm,flags) { .vm_mm =3D (mm), .vm_flags =3D (flags) } =20 diff --git a/include/trace/events/mmflags.h b/include/trace/events/mmflags.h index 3bc8656c8359..0c7d50ab56cd 100644 --- a/include/trace/events/mmflags.h +++ b/include/trace/events/mmflags.h @@ -160,6 +160,12 @@ IF_HAVE_PG_ARCH_3(arch_3) # define IF_HAVE_VM_DROPPABLE(flag, name) #endif =20 +#ifdef CONFIG_MSHARE +# define IF_HAVE_VM_MSHARE(flag, name) {flag, name}, +#else +# define IF_HAVE_VM_MSHARE(flag, name) +#endif + #define __def_vmaflag_names \ {VM_READ, "read" }, \ {VM_WRITE, "write" }, \ @@ -193,6 +199,7 @@ IF_HAVE_VM_SOFTDIRTY(VM_SOFTDIRTY, "softdirty" ) \ {VM_HUGEPAGE, "hugepage" }, \ {VM_NOHUGEPAGE, "nohugepage" }, \ IF_HAVE_VM_DROPPABLE(VM_DROPPABLE, "droppable" ) \ +IF_HAVE_VM_MSHARE(VM_MSHARE, "mshare" ) \ {VM_MERGEABLE, "mergeable" } \ =20 #define show_vma_flags(flags) \ --=20 2.43.5