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| author | Eric Dumazet <edumazet@google.com> | 2014-05-27 10:28:55 -0700 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2014-06-20 21:26:05 +0800 |
| commit | 42614b0582542a2ab26d86956d92b4f54c69d735 (patch) | |
| tree | 7dd0927fff88427d50b45d2b279694f1a5f70954 | |
| parent | d656c180de4d3eacd610c414fbcfe2509cf64a99 (diff) | |
| download | lwn-42614b0582542a2ab26d86956d92b4f54c69d735.tar.gz lwn-42614b0582542a2ab26d86956d92b4f54c69d735.zip | |
crypto: lzo - try kmalloc() before vmalloc()
zswap allocates one LZO context per online cpu.
Using vmalloc() for small (16KB) memory areas has drawback of slowing
down /proc/vmallocinfo and /proc/meminfo reads, TLB pressure and poor
NUMA locality, as default NUMA policy at boot time is to interleave
pages :
edumazet:~# grep lzo /proc/vmallocinfo | head -4
0xffffc90006062000-0xffffc90006067000 20480 lzo_init+0x1b/0x30 pages=4 vmalloc N0=2 N1=2
0xffffc90006067000-0xffffc9000606c000 20480 lzo_init+0x1b/0x30 pages=4 vmalloc N0=2 N1=2
0xffffc9000606c000-0xffffc90006071000 20480 lzo_init+0x1b/0x30 pages=4 vmalloc N0=2 N1=2
0xffffc90006071000-0xffffc90006076000 20480 lzo_init+0x1b/0x30 pages=4 vmalloc N0=2 N1=2
This patch tries a regular kmalloc() and fallback to vmalloc in case
memory is too fragmented.
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
| -rw-r--r-- | crypto/lzo.c | 11 |
1 files changed, 9 insertions, 2 deletions
diff --git a/crypto/lzo.c b/crypto/lzo.c index 1c2aa69c54b8..252e791d0ccc 100644 --- a/crypto/lzo.c +++ b/crypto/lzo.c @@ -20,6 +20,7 @@ #include <linux/module.h> #include <linux/crypto.h> #include <linux/vmalloc.h> +#include <linux/mm.h> #include <linux/lzo.h> struct lzo_ctx { @@ -30,7 +31,10 @@ static int lzo_init(struct crypto_tfm *tfm) { struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); - ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS); + ctx->lzo_comp_mem = kmalloc(LZO1X_MEM_COMPRESS, + GFP_KERNEL | __GFP_NOWARN | __GFP_REPEAT); + if (!ctx->lzo_comp_mem) + ctx->lzo_comp_mem = vmalloc(LZO1X_MEM_COMPRESS); if (!ctx->lzo_comp_mem) return -ENOMEM; @@ -41,7 +45,10 @@ static void lzo_exit(struct crypto_tfm *tfm) { struct lzo_ctx *ctx = crypto_tfm_ctx(tfm); - vfree(ctx->lzo_comp_mem); + if (is_vmalloc_addr(ctx->lzo_comp_mem)) + vfree(ctx->lzo_comp_mem); + else + kfree(ctx->lzo_comp_mem); } static int lzo_compress(struct crypto_tfm *tfm, const u8 *src, |