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71baba4b92
__GFP_WAIT was used to signal that the caller was in atomic context and could not sleep. Now it is possible to distinguish between true atomic context and callers that are not willing to sleep. The latter should clear __GFP_DIRECT_RECLAIM so kswapd will still wake. As clearing __GFP_WAIT behaves differently, there is a risk that people will clear the wrong flags. This patch renames __GFP_WAIT to __GFP_RECLAIM to clearly indicate what it does -- setting it allows all reclaim activity, clearing them prevents it. [akpm@linux-foundation.org: fix build] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Mel Gorman <mgorman@techsingularity.net> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Cc: Christoph Lameter <cl@linux.com> Acked-by: David Rientjes <rientjes@google.com> Cc: Vitaly Wool <vitalywool@gmail.com> Cc: Rik van Riel <riel@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
61 lines
1.3 KiB
C
61 lines
1.3 KiB
C
#include <linux/fault-inject.h>
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#include <linux/slab.h>
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static struct {
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struct fault_attr attr;
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bool ignore_gfp_reclaim;
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bool cache_filter;
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} failslab = {
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.attr = FAULT_ATTR_INITIALIZER,
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.ignore_gfp_reclaim = true,
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.cache_filter = false,
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};
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bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags)
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{
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if (gfpflags & __GFP_NOFAIL)
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return false;
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if (failslab.ignore_gfp_reclaim && (gfpflags & __GFP_RECLAIM))
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return false;
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if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB))
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return false;
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return should_fail(&failslab.attr, size);
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}
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static int __init setup_failslab(char *str)
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{
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return setup_fault_attr(&failslab.attr, str);
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}
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__setup("failslab=", setup_failslab);
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#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
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static int __init failslab_debugfs_init(void)
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{
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struct dentry *dir;
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umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
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dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
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if (IS_ERR(dir))
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return PTR_ERR(dir);
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if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
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&failslab.ignore_gfp_reclaim))
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goto fail;
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if (!debugfs_create_bool("cache-filter", mode, dir,
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&failslab.cache_filter))
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goto fail;
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return 0;
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fail:
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debugfs_remove_recursive(dir);
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return -ENOMEM;
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}
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late_initcall(failslab_debugfs_init);
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#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */
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