The patch titled Subject: fs, seq_file: fallback to vmalloc instead of oom kill processes has been removed from the -mm tree. Its filename was fs-seq_file-fallback-to-vmalloc-instead-of-oom-kill-processes.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: David Rientjes <rientjes@xxxxxxxxxx> Subject: fs, seq_file: fallback to vmalloc instead of oom kill processes Since commit 058504edd026 ("fs/seq_file: fallback to vmalloc allocation"), seq_buf_alloc() falls back to vmalloc() when the kmalloc() for contiguous memory fails. This was done to address order-4 slab allocations for reading /proc/stat on large machines and noticed because PAGE_ALLOC_COSTLY_ORDER < 4, so there is no infinite loop in the page allocator when allocating new slab for such high-order allocations. Contiguous memory isn't necessary for caller of seq_buf_alloc(), however. Other GFP_KERNEL high-order allocations that are <= PAGE_ALLOC_COSTLY_ORDER will simply loop forever in the page allocator and oom kill processes as a result. We don't want to kill processes so that we can allocate contiguous memory in situations when contiguous memory isn't necessary. This patch does the kmalloc() allocation with __GFP_NORETRY for high-order allocations. This still utilizes memory compaction and direct reclaim in the allocation path, the only difference is that it will fail immediately instead of oom kill processes when out of memory. [akpm@xxxxxxxxxxxxxxxxxxxx: add comment] Signed-off-by: David Rientjes <rientjes@xxxxxxxxxx> Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx> Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx> Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- fs/seq_file.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) diff -puN fs/seq_file.c~fs-seq_file-fallback-to-vmalloc-instead-of-oom-kill-processes fs/seq_file.c --- a/fs/seq_file.c~fs-seq_file-fallback-to-vmalloc-instead-of-oom-kill-processes +++ a/fs/seq_file.c @@ -25,7 +25,11 @@ static void *seq_buf_alloc(unsigned long { void *buf; - buf = kmalloc(size, GFP_KERNEL | __GFP_NOWARN); + /* + * __GFP_NORETRY to avoid oom-killings with high-order allocations - + * it's better to fall back to vmalloc() than to kill things. + */ + buf = kmalloc(size, GFP_KERNEL | __GFP_NORETRY | __GFP_NOWARN); if (!buf && size > PAGE_SIZE) buf = vmalloc(size); return buf; _ Patches currently in -mm which might be from rientjes@xxxxxxxxxx are origin.patch mm-page_alloc-embed-oom-killing-naturally-into-allocation-slowpath.patch mm-utilc-add-kstrimdup.patch sysctl-terminate-strings-also-on-r.patch sysctl-terminate-strings-also-on-r-fix.patch linux-next.patch lib-show_mem-this-patch-adds-cma-reserved-infromation.patch lib-show_mem-this-patch-adds-cma-reserved-infromation-fix.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html