From: Vlastimil Babka <vbabka@xxxxxxx> Subject: mm: /proc/pid/smaps_rollup: convert to single value seq_file The /proc/pid/smaps_rollup file is currently implemented via the m_start/m_next/m_stop seq_file iterators shared with the other maps files, that iterate over vma's. However, the rollup file doesn't print anything for each vma, only accumulate the stats. There are some issues with the current code as reported in [1] - the accumulated stats can get skewed if seq_file start()/stop() op is called multiple times, if show() is called multiple times, and after seeks to non-zero position. Patch [1] fixed those within existing design, but I believe it is fundamentally wrong to expose the vma iterators to the seq_file mechanism when smaps_rollup shows logically a single set of values for the whole address space. This patch thus refactors the code to provide a single "value" at offset 0, with vma iteration to gather the stats done internally. This fixes the situations where results are skewed, and simplifies the code, especially in show_smap(), at the expense of somewhat less code reuse. [1] https://marc.info/?l=linux-mm&m=151927723128134&w=2 [vbabka@suse.c: use seq_file infrastructure] Link: http://lkml.kernel.org/r/bf4525b0-fd5b-4c4c-2cb3-adee3dd95a48@xxxxxxx Link: http://lkml.kernel.org/r/20180723111933.15443-5-vbabka@xxxxxxx Signed-off-by: Vlastimil Babka <vbabka@xxxxxxx> Reported-by: Daniel Colascione <dancol@xxxxxxxxxx> Reviewed-by: Alexey Dobriyan <adobriyan@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- diff -puN fs/proc/task_mmu.c~mm-proc-pid-smaps_rollup-convert-to-single-value-seq_file fs/proc/task_mmu.c --- a/fs/proc/task_mmu.c~mm-proc-pid-smaps_rollup-convert-to-single-value-seq_file +++ a/fs/proc/task_mmu.c @@ -247,7 +247,6 @@ static int proc_map_release(struct inode if (priv->mm) mmdrop(priv->mm); - kfree(priv->rollup); return seq_release_private(inode, file); } @@ -404,7 +403,6 @@ const struct file_operations proc_pid_ma #ifdef CONFIG_PROC_PAGE_MONITOR struct mem_size_stats { - bool first; unsigned long resident; unsigned long shared_clean; unsigned long shared_dirty; @@ -418,7 +416,6 @@ struct mem_size_stats { unsigned long swap; unsigned long shared_hugetlb; unsigned long private_hugetlb; - unsigned long first_vma_start; u64 pss; u64 pss_locked; u64 swap_pss; @@ -775,57 +772,75 @@ static void __show_smap(struct seq_file static int show_smap(struct seq_file *m, void *v) { - struct proc_maps_private *priv = m->private; struct vm_area_struct *vma = v; - struct mem_size_stats mss_stack; - struct mem_size_stats *mss; + struct mem_size_stats mss; + + memset(&mss, 0, sizeof(mss)); + + smap_gather_stats(vma, &mss); + + show_map_vma(m, vma); + + SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); + SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); + SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); + seq_puts(m, " kB\n"); + + __show_smap(m, &mss); + + if (arch_pkeys_enabled()) + seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); + show_smap_vma_flags(m, vma); + + m_cache_vma(m, vma); + + return 0; +} + +static int show_smaps_rollup(struct seq_file *m, void *v) +{ + struct proc_maps_private *priv = m->private; + struct mem_size_stats mss; + struct mm_struct *mm; + struct vm_area_struct *vma; + unsigned long last_vma_end = 0; int ret = 0; - bool rollup_mode; - bool last_vma; - if (priv->rollup) { - rollup_mode = true; - mss = priv->rollup; - if (mss->first) { - mss->first_vma_start = vma->vm_start; - mss->first = false; - } - last_vma = !m_next_vma(priv, vma); - } else { - rollup_mode = false; - memset(&mss_stack, 0, sizeof(mss_stack)); - mss = &mss_stack; - } + priv->task = get_proc_task(priv->inode); + if (!priv->task) + return -ESRCH; - smap_gather_stats(vma, mss); - - if (!rollup_mode) { - show_map_vma(m, vma); - } else if (last_vma) { - show_vma_header_prefix( - m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0); - seq_pad(m, ' '); - seq_puts(m, "[rollup]\n"); - } else { - ret = SEQ_SKIP; + mm = priv->mm; + if (!mm || !mmget_not_zero(mm)) { + ret = -ESRCH; + goto out_put_task; } - if (!rollup_mode) { - SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); - SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); - SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); - seq_puts(m, " kB\n"); - } + memset(&mss, 0, sizeof(mss)); - if (!rollup_mode || last_vma) - __show_smap(m, mss); + down_read(&mm->mmap_sem); + hold_task_mempolicy(priv); - if (!rollup_mode) { - if (arch_pkeys_enabled()) - seq_printf(m, "ProtectionKey: %8u\n", vma_pkey(vma)); - show_smap_vma_flags(m, vma); + for (vma = priv->mm->mmap; vma; vma = vma->vm_next) { + smap_gather_stats(vma, &mss); + last_vma_end = vma->vm_end; } - m_cache_vma(m, vma); + + show_vma_header_prefix(m, priv->mm->mmap->vm_start, + last_vma_end, 0, 0, 0, 0); + seq_pad(m, ' '); + seq_puts(m, "[rollup]\n"); + + __show_smap(m, &mss); + + release_task_mempolicy(priv); + up_read(&mm->mmap_sem); + mmput(mm); + +out_put_task: + put_task_struct(priv->task); + priv->task = NULL; + return ret; } #undef SEQ_PUT_DEC @@ -842,23 +857,45 @@ static int pid_smaps_open(struct inode * return do_maps_open(inode, file, &proc_pid_smaps_op); } -static int pid_smaps_rollup_open(struct inode *inode, struct file *file) +static int smaps_rollup_open(struct inode *inode, struct file *file) { - struct seq_file *seq; + int ret; struct proc_maps_private *priv; - int ret = do_maps_open(inode, file, &proc_pid_smaps_op); - if (ret < 0) - return ret; - seq = file->private_data; - priv = seq->private; - priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL); - if (!priv->rollup) { - proc_map_release(inode, file); + priv = kzalloc(sizeof(*priv), GFP_KERNEL_ACCOUNT); + if (!priv) return -ENOMEM; + + ret = single_open(file, show_smaps_rollup, priv); + if (ret) + goto out_free; + + priv->inode = inode; + priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); + if (IS_ERR(priv->mm)) { + ret = PTR_ERR(priv->mm); + + single_release(inode, file); + goto out_free; } - priv->rollup->first = true; + return 0; + +out_free: + kfree(priv); + return ret; +} + +static int smaps_rollup_release(struct inode *inode, struct file *file) +{ + struct seq_file *seq = file->private_data; + struct proc_maps_private *priv = seq->private; + + if (priv->mm) + mmdrop(priv->mm); + + kfree(priv); + return single_release(inode, file); } const struct file_operations proc_pid_smaps_operations = { @@ -869,10 +906,10 @@ const struct file_operations proc_pid_sm }; const struct file_operations proc_pid_smaps_rollup_operations = { - .open = pid_smaps_rollup_open, + .open = smaps_rollup_open, .read = seq_read, .llseek = seq_lseek, - .release = proc_map_release, + .release = smaps_rollup_release, }; enum clear_refs_types { diff -puN fs/proc/internal.h~mm-proc-pid-smaps_rollup-convert-to-single-value-seq_file fs/proc/internal.h --- a/fs/proc/internal.h~mm-proc-pid-smaps_rollup-convert-to-single-value-seq_file +++ a/fs/proc/internal.h @@ -285,7 +285,6 @@ struct proc_maps_private { struct inode *inode; struct task_struct *task; struct mm_struct *mm; - struct mem_size_stats *rollup; #ifdef CONFIG_MMU struct vm_area_struct *tail_vma; #endif _
