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AJvYcCWkREzopmYOgJQRMlloUIIUjRJfdE4RW4mO2yaTxyFqhaTgqPm6XLzY+4DPCwVFMOVMGgqUpSgBrSs=@vger.kernel.org X-Gm-Message-State: AOJu0YyWKdOHNP28/wZcrc+Ym8N6af7rQtxjV9aL6/z0DwHFmhTTkDVg UQCV+ULmgFMICye27rLkzUjxvFt9HwpZbCXUxZQop+nFgW2AFo5RphiuUYBgpchVZbBuJb+GwMQ n6Q== X-Google-Smtp-Source: AGHT+IFTyAfsIAx+W8ijjylMHsN3oJ/EjAkXBdrJzAHIWy/euYIgMSi4UM4+efBYB633hSURtx6BkjgnB9k= X-Received: from pjbtb14.prod.google.com ([2002:a17:90b:53ce:b0:2ef:7352:9e97]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:548f:b0:2ee:7870:8835 with SMTP id 98e67ed59e1d1-2f548f80206mr20438054a91.33.1736569595602; Fri, 10 Jan 2025 20:26:35 -0800 (PST) Date: Fri, 10 Jan 2025 20:26:00 -0800 In-Reply-To: <20250111042604.3230628-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250111042604.3230628-1-surenb@google.com> X-Mailer: git-send-email 2.47.1.613.gc27f4b7a9f-goog Message-ID: <20250111042604.3230628-14-surenb@google.com> Subject: [PATCH v9 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, david.laight.linux@gmail.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, richard.weiyang@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 Acked-by: Vlastimil Babka --- mm/debug.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/mm/debug.c b/mm/debug.c index 8d2acf432385..325d7bf22038 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -178,6 +178,17 @@ EXPORT_SYMBOL(dump_page); void dump_vma(const struct vm_area_struct *vma) { +#ifdef CONFIG_PER_VMA_LOCK + 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) 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, refcount_read(&vma->vm_refcnt)); +#else 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" @@ -187,6 +198,7 @@ void dump_vma(const struct vm_area_struct *vma) vma->anon_vma, vma->vm_ops, vma->vm_pgoff, vma->vm_file, vma->vm_private_data, vma->vm_flags, &vma->vm_flags); +#endif } EXPORT_SYMBOL(dump_vma); -- 2.47.1.613.gc27f4b7a9f-goog