From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1C590C433B4 for ; Sat, 17 Apr 2021 03:05:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D5DF760FE4 for ; Sat, 17 Apr 2021 03:05:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235302AbhDQDGJ (ORCPT ); Fri, 16 Apr 2021 23:06:09 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:40618 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233892AbhDQDGI (ORCPT ); Fri, 16 Apr 2021 23:06:08 -0400 Received: from mail-pg1-x52f.google.com (mail-pg1-x52f.google.com [IPv6:2607:f8b0:4864:20::52f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 4C325C061756 for ; Fri, 16 Apr 2021 20:05:43 -0700 (PDT) Received: by mail-pg1-x52f.google.com with SMTP id y32so20411977pga.11 for ; Fri, 16 Apr 2021 20:05:43 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bytedance-com.20150623.gappssmtp.com; s=20150623; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=bHCf5UQTYn2bzHAIxxFwJe4NilZMkFnnQjfN/tw6leQ=; b=n61e/1KAdf1RUa9/A0vGa+G1R5yn3UvamgGM5vioyOhvsC7h+wCTixVZg86TS541WU R8TU5pXU9MUbvdyWRtl6C0GfJENOWgnBmUU2hmOHFrJ9h2szYfycj7o+MnjynclzZ44P 06lQZSZ3mYaaJ4nkMRlaCm26Sf0szLIkBUKc1J5cy5PMUyz1Z9kwM6jRJoYXa5U5RobQ zblfP1FbMCdsUMHqjPwP3GWYp/dgh0UATncRfnzYtHaZTtSkX1rBJdSZlKfs0edGZ5qz vvtkA1Jqv0BKExSE4L/W/o00frQk83IxteUEyIN0IHmvryYeMNP4yxxYZsLUfrTpNeNi 5cRA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=bHCf5UQTYn2bzHAIxxFwJe4NilZMkFnnQjfN/tw6leQ=; b=quVqseP5g+UztluBht75B1iu3CbaXYKm88bnCxNUB4a2wzOYyxt1rLToE14dVO4tx0 3oPGHb2LuP0In/BfuP01QYtR980HLtXophwk3dBfPvvm/k1I7jucY0IL5riA+IUhKTZW aG4B3ilLQ+3BzeGE2aQsqjW2zXF0zyXfMP6YpMZCRjyW1GvWNKJ2J4UyYWZVXSl+M4vM qvBi8iIVJwMmLJC8dbSBFafKDQCrMVfm6dpGh4Af0P8mBFcf19h0oYvkdn4lsiq3rP+z clMf82i5FxkC+APVCaIjFFmh4Qf4EUfdHQcfRohCKUhXLa05wBnAJdqJ+j6EyvwL82gD 7K5w== X-Gm-Message-State: AOAM531LjIuBZlgqmjEYYk3Fy0K1jY6mJ3IThKGpzX4+3kRccAlJjz68 KSWS0DWLIZFrXLgTdhvte0YSb8hBWP4REXMpBO8RJQ== X-Google-Smtp-Source: ABdhPJyK4BBGaD9t3gPFxc+8SqQhlSLgQglphmgvYni9MGpWj4MATlSNlLHKChZw1xf3C/bEh5cLKwFgEjMc0mQw4kc= X-Received: by 2002:a63:1665:: with SMTP id 37mr1844976pgw.31.1618628742644; Fri, 16 Apr 2021 20:05:42 -0700 (PDT) MIME-Version: 1.0 References: <20210416160754.2944-1-peter.enderborg@sony.com> In-Reply-To: <20210416160754.2944-1-peter.enderborg@sony.com> From: Muchun Song Date: Sat, 17 Apr 2021 11:05:06 +0800 Message-ID: Subject: Re: [External] [PATCH v3] dma-buf: Add DmaBufTotal counter in meminfo To: Peter Enderborg Cc: LKML , linux-fsdevel , Sumit Semwal , =?UTF-8?Q?Christian_K=C3=B6nig?= , Alexey Dobriyan , Andrew Morton , Roman Gushchin , Shakeel Butt , Michal Hocko , NeilBrown , Sami Tolvanen , Mike Rapoport , linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org, linaro-mm-sig@lists.linaro.org, Matthew Wilcox Content-Type: text/plain; charset="UTF-8" Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On Sat, Apr 17, 2021 at 12:08 AM Peter Enderborg wrote: > > This adds a total used dma-buf memory. Details > can be found in debugfs, however it is not for everyone > and not always available. dma-buf are indirect allocated by > userspace. So with this value we can monitor and detect > userspace applications that have problems. I want to know more details about the problems. Can you share what problems you have encountered? Thanks. > > Signed-off-by: Peter Enderborg > --- > drivers/dma-buf/dma-buf.c | 12 ++++++++++++ > fs/proc/meminfo.c | 5 ++++- > include/linux/dma-buf.h | 1 + > 3 files changed, 17 insertions(+), 1 deletion(-) > > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c > index f264b70c383e..d40fff2ae1fa 100644 > --- a/drivers/dma-buf/dma-buf.c > +++ b/drivers/dma-buf/dma-buf.c > @@ -37,6 +37,7 @@ struct dma_buf_list { > }; > > static struct dma_buf_list db_list; > +static atomic_long_t dma_buf_global_allocated; > > static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen) > { > @@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry) > if (dmabuf->resv == (struct dma_resv *)&dmabuf[1]) > dma_resv_fini(dmabuf->resv); > > + atomic_long_sub(dmabuf->size, &dma_buf_global_allocated); > module_put(dmabuf->owner); > kfree(dmabuf->name); > kfree(dmabuf); > @@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info) > mutex_lock(&db_list.lock); > list_add(&dmabuf->list_node, &db_list.head); > mutex_unlock(&db_list.lock); > + atomic_long_add(dmabuf->size, &dma_buf_global_allocated); > > return dmabuf; > > @@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map) > } > EXPORT_SYMBOL_GPL(dma_buf_vunmap); > > +/** > + * dma_buf_get_size - Return the used nr pages by dma-buf > + */ > +long dma_buf_allocated_pages(void) > +{ > + return atomic_long_read(&dma_buf_global_allocated) >> PAGE_SHIFT; > +} > +EXPORT_SYMBOL_GPL(dma_buf_allocated_pages); Why need "EXPORT_SYMBOL_GPL"? > + > #ifdef CONFIG_DEBUG_FS > static int dma_buf_debug_show(struct seq_file *s, void *unused) > { > diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c > index 6fa761c9cc78..ccc7c40c8db7 100644 > --- a/fs/proc/meminfo.c > +++ b/fs/proc/meminfo.c > @@ -16,6 +16,7 @@ > #ifdef CONFIG_CMA > #include > #endif > +#include > #include > #include "internal.h" > > @@ -145,7 +146,9 @@ static int meminfo_proc_show(struct seq_file *m, void *v) > show_val_kb(m, "CmaFree: ", > global_zone_page_state(NR_FREE_CMA_PAGES)); > #endif > - > +#ifdef CONFIG_DMA_SHARED_BUFFER > + show_val_kb(m, "DmaBufTotal: ", dma_buf_allocated_pages()); > +#endif > hugetlb_report_meminfo(m); > > arch_report_meminfo(m); > diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h > index efdc56b9d95f..5b05816bd2cd 100644 > --- a/include/linux/dma-buf.h > +++ b/include/linux/dma-buf.h > @@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *, > unsigned long); > int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map); > void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map); > +long dma_buf_allocated_pages(void); > #endif /* __DMA_BUF_H__ */ > -- > 2.17.1 >