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AJvYcCVxFNEp2iapR8ecTQFAa3EsyyxifHx4MYA8q4zt58pNJEToWtZsdCF/qhJblufhEqw9VasNYjdWW2Y=@vger.kernel.org X-Gm-Message-State: AOJu0YzwFakOTEodZjaRBfmKrvlxH2oBO9ggcM2Y4p2obGucWq9DtQG3 /y69fJR3apCeApGVv3nQ2RXo5N6hsFIrLGqxROS2rYQIp5Kgd2tkk4gccJLg6XfzqEyqZ81OTqJ WpQ== X-Google-Smtp-Source: AGHT+IEG5TzQ5WphA3eoGz/MbiJJmFDDNhcID7zswYwLoeBJDVpj8ipi2aVpjRu++rbXJdGfCBLbRXGohaw= X-Received: from pfbdc3.prod.google.com ([2002:a05:6a00:35c3:b0:725:cd3b:326c]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:8412:b0:1e1:a671:7122 with SMTP id adf61e73a8af0-1e5e044635dmr39159145637.2.1735232860104; Thu, 26 Dec 2024 09:07:40 -0800 (PST) Date: Thu, 26 Dec 2024 09:07:05 -0800 In-Reply-To: <20241226170710.1159679-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241226170710.1159679-1-surenb@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20241226170710.1159679-14-surenb@google.com> Subject: [PATCH v7 13/17] mm/debug: print vm_refcnt state when dumping the vma From: Suren Baghdasaryan To: akpm@linux-foundation.org Cc: peterz@infradead.org, willy@infradead.org, liam.howlett@oracle.com, lorenzo.stoakes@oracle.com, mhocko@suse.com, vbabka@suse.cz, hannes@cmpxchg.org, mjguzik@gmail.com, oliver.sang@intel.com, mgorman@techsingularity.net, david@redhat.com, peterx@redhat.com, oleg@redhat.com, dave@stgolabs.net, paulmck@kernel.org, brauner@kernel.org, dhowells@redhat.com, hdanton@sina.com, hughd@google.com, lokeshgidra@google.com, minchan@google.com, jannh@google.com, shakeel.butt@linux.dev, souravpanda@google.com, pasha.tatashin@soleen.com, klarasmodin@gmail.com, corbet@lwn.net, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, kernel-team@android.com, surenb@google.com Content-Type: text/plain; charset="UTF-8" vm_refcnt encodes a number of useful states: - whether vma is attached or detached - the number of current vma readers - presence of a vma writer Let's include it in the vma dump. Signed-off-by: Suren Baghdasaryan --- mm/debug.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/debug.c b/mm/debug.c index 95b6ab809c0e..68b3ba3cf603 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -181,12 +181,12 @@ void dump_vma(const struct vm_area_struct *vma) pr_emerg("vma %px start %px end %px mm %px\n" "prot %lx anon_vma %px vm_ops %px\n" "pgoff %lx file %px private_data %px\n" - "flags: %#lx(%pGv)\n", + "flags: %#lx(%pGv) refcnt %x\n", vma, (void *)vma->vm_start, (void *)vma->vm_end, vma->vm_mm, (unsigned long)pgprot_val(vma->vm_page_prot), vma->anon_vma, vma->vm_ops, vma->vm_pgoff, vma->vm_file, vma->vm_private_data, - vma->vm_flags, &vma->vm_flags); + vma->vm_flags, &vma->vm_flags, refcount_read(&vma->vm_refcnt)); } EXPORT_SYMBOL(dump_vma); -- 2.47.1.613.gc27f4b7a9f-goog