Cc Andrew On (11/20/15 19:02), Kyeongdon Kim wrote: > When we're using LZ4 multi compression streams for zram swap, > we found out page allocation failure message in system running test. > That was not only once, but a few(2 - 5 times per test). > Also, some failure cases were continually occurring to try allocation > order 3. > > In order to make parallel compression private data, we should call > kzalloc() with order 2/3 in runtime(lzo/lz4). But if there is no order > 2/3 size memory in that time, page allocation fails. > This patch makes to use vmalloc() as fallback of kmalloc(), this > prevents page alloc failure warning. > > After this, we never found warning message in running test, also > It could reduce process startup latency about 60-120ms in each case.
Acked-by: Sergey Senozhatsky <sergey.senozhat...@gmail.com> thanks. -ss > For reference a call trace : > > Binder_1: page allocation failure: order:3, mode:0x10c0d0 > CPU: 0 PID: 424 Comm: Binder_1 Tainted: GW 3.10.49-perf-g991d02b-dirty #20 > Call trace: > [<ffffffc0002069c8>] dump_backtrace+0x0/0x270 > [<ffffffc000206c48>] show_stack+0x10/0x1c > [<ffffffc000cb51c8>] dump_stack+0x1c/0x28 > [<ffffffc0002bbfc8>] warn_alloc_failed+0xfc/0x11c > [<ffffffc0002bf518>] __alloc_pages_nodemask+0x724/0x7f0 > [<ffffffc0002bf5f8>] __get_free_pages+0x14/0x5c > [<ffffffc0002ed6a4>] kmalloc_order_trace+0x38/0xd8 > [<ffffffc0005d9738>] zcomp_lz4_create+0x2c/0x38 > [<ffffffc0005d78f0>] zcomp_strm_alloc+0x34/0x78 > [<ffffffc0005d7a58>] zcomp_strm_multi_find+0x124/0x1ec > [<ffffffc0005d7c14>] zcomp_strm_find+0xc/0x18 > [<ffffffc0005d8fa0>] zram_bvec_rw+0x2fc/0x780 > [<ffffffc0005d9680>] zram_make_request+0x25c/0x2d4 > [<ffffffc00040f8ac>] generic_make_request+0x80/0xbc > [<ffffffc00040f98c>] submit_bio+0xa4/0x15c > [<ffffffc0002e8bb0>] __swap_writepage+0x218/0x230 > [<ffffffc0002e8c04>] swap_writepage+0x3c/0x4c > [<ffffffc0002c7384>] shrink_page_list+0x51c/0x8d0 > [<ffffffc0002c7e88>] shrink_inactive_list+0x3f8/0x60c > [<ffffffc0002c86c8>] shrink_lruvec+0x33c/0x4cc > [<ffffffc0002c8894>] shrink_zone+0x3c/0x100 > [<ffffffc0002c8c10>] try_to_free_pages+0x2b8/0x54c > [<ffffffc0002bf308>] __alloc_pages_nodemask+0x514/0x7f0 > [<ffffffc0002bf5f8>] __get_free_pages+0x14/0x5c > [<ffffffc0003446cc>] proc_info_read+0x50/0xe4 > [<ffffffc0002f5204>] vfs_read+0xa0/0x12c > [<ffffffc0002f59c8>] SyS_read+0x44/0x74 > DMA: 3397*4kB (MC) 26*8kB (RC) 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB > 0*512kB 0*1024kB 0*2048kB 0*4096kB = 13796kB > > Signed-off-by: Kyeongdon Kim <kyeongdon....@lge.com> > --- > drivers/block/zram/zcomp_lz4.c | 15 +++++++++++++-- > drivers/block/zram/zcomp_lzo.c | 15 +++++++++++++-- > 2 files changed, 26 insertions(+), 4 deletions(-) > > diff --git a/drivers/block/zram/zcomp_lz4.c b/drivers/block/zram/zcomp_lz4.c > index f2afb7e..0477894 100644 > --- a/drivers/block/zram/zcomp_lz4.c > +++ b/drivers/block/zram/zcomp_lz4.c > @@ -10,17 +10,28 @@ > #include <linux/kernel.h> > #include <linux/slab.h> > #include <linux/lz4.h> > +#include <linux/vmalloc.h> > +#include <linux/mm.h> > > #include "zcomp_lz4.h" > > static void *zcomp_lz4_create(void) > { > - return kzalloc(LZ4_MEM_COMPRESS, GFP_KERNEL); > + void *ret; > + > + ret = kzalloc(LZ4_MEM_COMPRESS, > + __GFP_NORETRY|__GFP_NOWARN|__GFP_NOMEMALLOC); > + if (!ret) > + ret = vzalloc(LZ4_MEM_COMPRESS); > + return ret; > } > > static void zcomp_lz4_destroy(void *private) > { > - kfree(private); > + if (is_vmalloc_addr(private)) > + vfree(private); > + else > + kfree(private); > } > > static int zcomp_lz4_compress(const unsigned char *src, unsigned char *dst, > diff --git a/drivers/block/zram/zcomp_lzo.c b/drivers/block/zram/zcomp_lzo.c > index da1bc47..613fbac 100644 > --- a/drivers/block/zram/zcomp_lzo.c > +++ b/drivers/block/zram/zcomp_lzo.c > @@ -10,17 +10,28 @@ > #include <linux/kernel.h> > #include <linux/slab.h> > #include <linux/lzo.h> > +#include <linux/vmalloc.h> > +#include <linux/mm.h> > > #include "zcomp_lzo.h" > > static void *lzo_create(void) > { > - return kzalloc(LZO1X_MEM_COMPRESS, GFP_KERNEL); > + void *ret; > + > + ret = kzalloc(LZO1X_MEM_COMPRESS, > + __GFP_NORETRY|__GFP_NOWARN|__GFP_NOMEMALLOC); > + if (!ret) > + ret = vzalloc(LZO1X_MEM_COMPRESS); > + return ret; > } > > static void lzo_destroy(void *private) > { > - kfree(private); > + if (is_vmalloc_addr(private)) > + vfree(private); > + else > + kfree(private); > } > > static int lzo_compress(const unsigned char *src, unsigned char *dst, > -- > 1.8.2 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/