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gcov: use kvmalloc()

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Using vmalloc() in gcov is really quite wasteful, many of the objects
allocated are really small (e.g.  I've seen 24 bytes.) Use kvmalloc() to
automatically pick the better of kmalloc() or vmalloc() depending on the
size.

[johannes.berg@intel.com: fix clang-11+ build]
  Link: https://lkml.kernel.org/r/20210412214210.6e1ecca9cdc5.I24459763acf0591d5e6b31c7e3a59890d802f79c@changeid

Link: https://lkml.kernel.org/r/20210315235453.799e7a9d627d.I741d0db096c6f312910f7f1bcdfde0fda20801a4@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Tested-by: Nick Desaulniers <ndesaulniers@google.com>
Cc: Peter Oberparleiter <oberpar@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Johannes Berg 2021-05-06 18:04:51 -07:00 • committed by Linus Torvalds
parent 3180c44fe1
commit 1391efa952
3 changed files with 12 additions and 12 deletions
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6
kernel/gcov/fs.c
View file

@ -26,7 +26,7 @@
#include <linux/slab.h>
#include <linux/mutex.h>
#include <linux/seq_file.h>
#include <linux/vmalloc.h>
#include <linux/mm.h>
#include "gcov.h"
/**
@ -116,7 +116,7 @@ static struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
/* Dry-run to get the actual buffer size. */
size = convert_to_gcda(NULL, info);
iter = vmalloc(struct_size(iter, buffer, size));
iter = kvmalloc(struct_size(iter, buffer, size), GFP_KERNEL);
if (!iter)
return NULL;
@ -134,7 +134,7 @@ static struct gcov_iterator *gcov_iter_new(struct gcov_info *info)
*/
static void gcov_iter_free(struct gcov_iterator *iter)
{
vfree(iter);
kvfree(iter);
}
/**