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authorJim Keniston <jkenisto@linux.vnet.ibm.com>2011-03-22 16:35:12 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-03-22 17:44:17 -0700
commit565d76cb7d5fd7cb010fd690602280a69ab116ef (patch)
treebeff4279da00976e10145820c22e699192056973 /crypto/deflate.c
parentb12d12596992f608f5506a8dabe4d1299594bd1e (diff)
downloadlinux-565d76cb7d5fd7cb010fd690602280a69ab116ef.tar.gz
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 <jkenisto@us.ibm.com> Cc: Herbert Xu <herbert@gondor.apana.org.au> Cc: David Miller <davem@davemloft.net> Cc: Chris Mason <chris.mason@oracle.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'crypto/deflate.c')
-rw-r--r--crypto/deflate.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/deflate.c b/crypto/deflate.c
index cbc7a33a960..b5ccae29be7 100644
--- a/crypto/deflate.c
+++ b/crypto/deflate.c
@@ -48,7 +48,8 @@ static int deflate_comp_init(struct deflate_ctx *ctx)
int ret = 0;
struct z_stream_s *stream = &ctx->comp_stream;
- stream->workspace = vzalloc(zlib_deflate_workspacesize());
+ stream->workspace = vzalloc(zlib_deflate_workspacesize(
+ -DEFLATE_DEF_WINBITS, DEFLATE_DEF_MEMLEVEL));
if (!stream->workspace) {
ret = -ENOMEM;
goto out;