From 565d76cb7d5fd7cb010fd690602280a69ab116ef Mon Sep 17 00:00:00 2001 From: Jim Keniston Date: Tue, 22 Mar 2011 16:35:12 -0700 Subject: zlib: slim down zlib_deflate() workspace when possible Instead of always creating a huge (268K) deflate_workspace with the maximum compression parameters (windowBits=15, memLevel=8), allow the caller to obtain a smaller workspace by specifying smaller parameter values. For example, when capturing oops and panic reports to a medium with limited capacity, such as NVRAM, compression may be the only way to capture the whole report. In this case, a small workspace (24K works fine) is a win, whether you allocate the workspace when you need it (i.e., during an oops or panic) or at boot time. I've verified that this patch works with all accepted values of windowBits (positive and negative), memLevel, and compression level. Signed-off-by: Jim Keniston Cc: Herbert Xu Cc: David Miller Cc: Chris Mason Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- crypto/zlib.c | 18 +++++++++++------- 1 file changed, 11 insertions(+), 7 deletions(-) (limited to 'crypto/zlib.c') diff --git a/crypto/zlib.c b/crypto/zlib.c index 739b8fca4cea..d11d761a5e41 100644 --- a/crypto/zlib.c +++ b/crypto/zlib.c @@ -85,6 +85,7 @@ static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params, struct zlib_ctx *ctx = crypto_tfm_ctx(crypto_pcomp_tfm(tfm)); struct z_stream_s *stream = &ctx->comp_stream; struct nlattr *tb[ZLIB_COMP_MAX + 1]; + int window_bits, mem_level; size_t workspacesize; int ret; @@ -94,7 +95,14 @@ static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params, zlib_comp_exit(ctx); - workspacesize = zlib_deflate_workspacesize(); + window_bits = tb[ZLIB_COMP_WINDOWBITS] + ? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS]) + : MAX_WBITS; + mem_level = tb[ZLIB_COMP_MEMLEVEL] + ? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL]) + : DEF_MEM_LEVEL; + + workspacesize = zlib_deflate_workspacesize(window_bits, mem_level); stream->workspace = vzalloc(workspacesize); if (!stream->workspace) return -ENOMEM; @@ -106,12 +114,8 @@ static int zlib_compress_setup(struct crypto_pcomp *tfm, void *params, tb[ZLIB_COMP_METHOD] ? nla_get_u32(tb[ZLIB_COMP_METHOD]) : Z_DEFLATED, - tb[ZLIB_COMP_WINDOWBITS] - ? nla_get_u32(tb[ZLIB_COMP_WINDOWBITS]) - : MAX_WBITS, - tb[ZLIB_COMP_MEMLEVEL] - ? nla_get_u32(tb[ZLIB_COMP_MEMLEVEL]) - : DEF_MEM_LEVEL, + window_bits, + mem_level, tb[ZLIB_COMP_STRATEGY] ? nla_get_u32(tb[ZLIB_COMP_STRATEGY]) : Z_DEFAULT_STRATEGY); -- cgit v1.2.3