From: Rafael Aquini <aquini@redhat.com>
To: Joel Savitz <jsavitz@redhat.com>
Cc: linux-kernel@vger.kernel.org,
Alexey Dobriyan <adobriyan@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
Vlastimil Babka <vbabka@suse.cz>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Michael Ellerman <mpe@ellerman.id.au>,
Ram Pai <linuxram@us.ibm.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Huang Ying <ying.huang@intel.com>,
Sandeep Patil <sspatil@android.com>,
Yury Norov <yury.norov@gmail.com>,
linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v3] fs/proc: add VmTaskSize field to /proc/$$/status
Date: Tue, 7 May 2019 08:54:31 -0400 [thread overview]
Message-ID: <20190507125430.GA31025@x230.aquini.net> (raw)
In-Reply-To: <1557158023-23021-1-git-send-email-jsavitz@redhat.com>
On Mon, May 06, 2019 at 11:53:43AM -0400, Joel Savitz wrote:
> There is currently no easy and architecture-independent way to find the
> lowest unusable virtual address available to a process without
> brute-force calculation. This patch allows a user to easily retrieve
> this value via /proc/<pid>/status.
>
> Using this patch, any program that previously needed to waste cpu cycles
> recalculating a non-sensitive process-dependent value already known to
> the kernel can now be optimized to use this mechanism.
>
> Signed-off-by: Joel Savitz <jsavitz@redhat.com>
> ---
> Documentation/filesystems/proc.txt | 2 ++
> fs/proc/task_mmu.c | 2 ++
> 2 files changed, 4 insertions(+)
>
> diff --git a/Documentation/filesystems/proc.txt b/Documentation/filesystems/proc.txt
> index 66cad5c86171..1c6a912e3975 100644
> --- a/Documentation/filesystems/proc.txt
> +++ b/Documentation/filesystems/proc.txt
> @@ -187,6 +187,7 @@ read the file /proc/PID/status:
> VmLib: 1412 kB
> VmPTE: 20 kb
> VmSwap: 0 kB
> + VmTaskSize: 137438953468 kB
> HugetlbPages: 0 kB
> CoreDumping: 0
> THP_enabled: 1
> @@ -263,6 +264,7 @@ Table 1-2: Contents of the status files (as of 4.19)
> VmPTE size of page table entries
> VmSwap amount of swap used by anonymous private data
> (shmem swap usage is not included)
> + VmTaskSize lowest unusable address in process virtual memory
Can we change this help text to "size of process' virtual address space memory" ?
> HugetlbPages size of hugetlb memory portions
> CoreDumping process's memory is currently being dumped
> (killing the process may lead to a corrupted core)
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 95ca1fe7283c..0af7081f7b19 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -74,6 +74,8 @@ void task_mem(struct seq_file *m, struct mm_struct *mm)
> seq_put_decimal_ull_width(m,
> " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8);
> SEQ_PUT_DEC(" kB\nVmSwap:\t", swap);
> + seq_put_decimal_ull_width(m,
> + " kB\nVmTaskSize:\t", mm->task_size >> 10, 8);
> seq_puts(m, " kB\n");
> hugetlb_report_usage(m, mm);
> }
> --
> 2.18.1
>
Acked-by: Rafael Aquini <aquini@redhat.com>
next prev parent reply other threads:[~2019-05-07 12:54 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-06 15:53 [PATCH v3] fs/proc: add VmTaskSize field to /proc/$$/status Joel Savitz
2019-05-07 12:54 ` Rafael Aquini [this message]
2019-05-08 6:37 ` Yury Norov
2019-05-08 13:47 ` Rafael Aquini
2019-05-10 3:32 ` Michael Ellerman
2019-05-10 7:25 ` Yury Norov
2019-05-14 6:17 ` Michael Ellerman
2019-05-19 21:31 ` Yury Norov
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