From 6e46b8b24ffbc4ecb5b606094dbc8ed5d6281f59 Mon Sep 17 00:00:00 2001 From: Igor Konopko Date: Sat, 4 May 2019 20:37:53 +0200 Subject: [PATCH] lightnvm: pblk: cleanly fail when there is not enough memory MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit L2P table can be huge in many cases, since it typically requires 1GB of DRAM for 1TB of drive. When there is not enough memory available, OOM killer turns on and kills random processes, which can be very annoying for users. This patch changes the flag for L2P table allocation on order to handle this situation in more user friendly way. GFP_KERNEL and __GPF_HIGHMEM are default flags used in parameterless vmalloc() calls, so they are also keeped in that patch. Additionally __GFP_NOWARN flag is added in order to hide very long dmesg warn in case of the allocation failures. The most important flag introduced in that patch is __GFP_RETRY_MAYFAIL, which would cause allocator to try use free memory and if not available to drop caches, but not to run OOM killer. Signed-off-by: Igor Konopko Reviewed-by: Hans Holmberg Reviewed-by: Javier González Signed-off-by: Matias Bjørling Signed-off-by: Jens Axboe --- drivers/lightnvm/pblk-init.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/drivers/lightnvm/pblk-init.c b/drivers/lightnvm/pblk-init.c index 81e8ed4d31ea..e0df3de1ce83 100644 --- a/drivers/lightnvm/pblk-init.c +++ b/drivers/lightnvm/pblk-init.c @@ -164,9 +164,14 @@ static int pblk_l2p_init(struct pblk *pblk, bool factory_init) int ret = 0; map_size = pblk_trans_map_size(pblk); - pblk->trans_map = vmalloc(map_size); - if (!pblk->trans_map) + pblk->trans_map = __vmalloc(map_size, GFP_KERNEL | __GFP_NOWARN + | __GFP_RETRY_MAYFAIL | __GFP_HIGHMEM, + PAGE_KERNEL); + if (!pblk->trans_map) { + pblk_err(pblk, "failed to allocate L2P (need %zu of memory)\n", + map_size); return -ENOMEM; + } pblk_ppa_set_empty(&ppa);