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AJvYcCUjHqg1f3fZKdg1j6P8r8tyj4wewel2vAslDCsxzS7oJoqb0vpd4YkketU9HBYOqUz0LN1GxpOJas3pjBc=@vger.kernel.org X-Gm-Message-State: AOJu0YxvmIPtiaW3IKYpkWo+MmwLXxBWNRQClbdlIKIWvonJU3o6nRnB +UBoXryHgb3ftEq2p3ixPAVi1nQoMg2zl3uDc5FqhjyrkkmD5uHbMIUONosZeKrmyYihHIQEwzX BUg== X-Google-Smtp-Source: AGHT+IGwKOeZSc6Bvv2juhw3MUD/Tqd1UKmaxd3x+03s9Ch1BsTNeSistfaqs0trat+JLYOevAMQcp8yyOk= X-Received: from plhj11.prod.google.com ([2002:a17:903:24b:b0:220:d668:ff81]) (user=surenb job=prod-delivery.src-stubby-dispatcher) by 2002:a17:903:32cf:b0:215:a04a:89d5 with SMTP id d9443c01a7336-220d1eb5718mr75972105ad.2.1739486847961; Thu, 13 Feb 2025 14:47:27 -0800 (PST) Date: Thu, 13 Feb 2025 14:46:51 -0800 In-Reply-To: <20250213224655.1680278-1-surenb@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20250213224655.1680278-1-surenb@google.com> X-Mailer: git-send-email 2.48.1.601.g30ceb7b040-goog Message-ID: <20250213224655.1680278-15-surenb@google.com> Subject: [PATCH v10 14/18] 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-Transfer-Encoding: quoted-printable 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 --- Changes since v9 [1]: - Minimized duplicate code, per Lorenzo Stoakes [1] https://lore.kernel.org/all/20250111042604.3230628-14-surenb@google.com/ mm/debug.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/mm/debug.c b/mm/debug.c index e1282b85a877..2d1bd67d957b 100644 --- a/mm/debug.c +++ b/mm/debug.c @@ -181,11 +181,17 @@ 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" +#ifdef CONFIG_PER_VMA_LOCK + "refcnt %x\n" +#endif "flags: %#lx(%pGv)\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, +#ifdef CONFIG_PER_VMA_LOCK + refcount_read(&vma->vm_refcnt), +#endif vma->vm_flags, &vma->vm_flags); } EXPORT_SYMBOL(dump_vma); --=20 2.48.1.601.g30ceb7b040-goog