The patch titled Subject: mm: vmalloc: show number of vmalloc pages in /proc/meminfo has been removed from the -mm tree. Its filename was mm-show-number-of-vmalloc-pages-in-proc-meminfo.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Roman Gushchin <guro@xxxxxx> Subject: mm: vmalloc: show number of vmalloc pages in /proc/meminfo Vmalloc() is getting more and more used these days (kernel stacks, bpf and percpu allocator are new top users), and the total % of memory consumed by vmalloc() can be pretty significant and changes dynamically. /proc/meminfo is the best place to display this information: its top goal is to show top consumers of the memory. Since the VmallocUsed field in /proc/meminfo is not in use for quite a long time (it has been defined to 0 by a5ad88ce8c7f ("mm: get rid of 'vmalloc_info' from /proc/meminfo")), let's reuse it for showing the actual physical memory consumption of vmalloc(). Link: http://lkml.kernel.org/r/20190417194002.12369-3-guro@xxxxxx Signed-off-by: Roman Gushchin <guro@xxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Vlastimil Babka <vbabka@xxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/proc/meminfo.c | 2 +- include/linux/vmalloc.h | 2 ++ mm/vmalloc.c | 10 ++++++++++ 3 files changed, 13 insertions(+), 1 deletion(-) --- a/fs/proc/meminfo.c~mm-show-number-of-vmalloc-pages-in-proc-meminfo +++ a/fs/proc/meminfo.c @@ -120,7 +120,7 @@ static int meminfo_proc_show(struct seq_ show_val_kb(m, "Committed_AS: ", committed); seq_printf(m, "VmallocTotal: %8lu kB\n", (unsigned long)VMALLOC_TOTAL >> 10); - show_val_kb(m, "VmallocUsed: ", 0ul); + show_val_kb(m, "VmallocUsed: ", vmalloc_nr_pages()); show_val_kb(m, "VmallocChunk: ", 0ul); show_val_kb(m, "Percpu: ", pcpu_nr_pages()); --- a/include/linux/vmalloc.h~mm-show-number-of-vmalloc-pages-in-proc-meminfo +++ a/include/linux/vmalloc.h @@ -72,10 +72,12 @@ extern void vm_unmap_aliases(void); #ifdef CONFIG_MMU extern void __init vmalloc_init(void); +extern unsigned long vmalloc_nr_pages(void); #else static inline void vmalloc_init(void) { } +static inline unsigned long vmalloc_nr_pages(void) { return 0; } #endif extern void *vmalloc(unsigned long size); --- a/mm/vmalloc.c~mm-show-number-of-vmalloc-pages-in-proc-meminfo +++ a/mm/vmalloc.c @@ -406,6 +406,13 @@ static void purge_vmap_area_lazy(void); static BLOCKING_NOTIFIER_HEAD(vmap_notify_list); static unsigned long lazy_max_pages(void); +static atomic_long_t nr_vmalloc_pages; + +unsigned long vmalloc_nr_pages(void) +{ + return atomic_long_read(&nr_vmalloc_pages); +} + static struct vmap_area *__find_vmap_area(unsigned long addr) { struct rb_node *n = vmap_area_root.rb_node; @@ -2237,6 +2244,7 @@ static void __vunmap(const void *addr, i BUG_ON(!page); __free_pages(page, 0); } + atomic_long_sub(area->nr_pages, &nr_vmalloc_pages); kvfree(area->pages); } @@ -2414,12 +2422,14 @@ static void *__vmalloc_area_node(struct if (unlikely(!page)) { /* Successfully allocated i pages, free them in __vunmap() */ area->nr_pages = i; + atomic_long_add(area->nr_pages, &nr_vmalloc_pages); goto fail; } area->pages[i] = page; if (gfpflags_allow_blocking(gfp_mask|highmem_mask)) cond_resched(); } + atomic_long_add(area->nr_pages, &nr_vmalloc_pages); if (map_vm_area(area, prot, pages)) goto fail; _ Patches currently in -mm which might be from guro@xxxxxx are